Worklife / Learn
What happens in the body, why does it happen, and how might it matter at work? Explore reliable information about biology, health conditions, life stages and working environments.
Choose a topic relevant to you, or read the chapters in order. Each combines biological explanations with a workplace perspective. We distinguish scientific findings from groups of people from an individual's experiences and needs.
Find a topic, explanation or professional term. Select a result to open its chapter.
You can also look up professional terms in the glossary.
Knowledge library
We explain terminology, biological processes and causes. We show why symptoms differ, what healthcare is available and how knowledge can be applied at work. New terms are explained as they appear and can also be found in the glossary.
To understand menstruation, fertility, pregnancy and menopause, we need to understand how organs, hormones and the nervous system work together. These processes are influenced by age, health, medicines and individual differences.
The uterus is a muscular organ in the pelvis, between the bladder and rectum. Its wall consists mostly of smooth muscle, the myometrium. Inside is the endometrium, or uterine lining. The lining changes in thickness and composition throughout the menstrual cycle in response to hormonal signals. During pregnancy, a fertilised egg may implant in the lining. Without pregnancy, falling hormone levels cause parts of the lining to be shed as menstrual bleeding.
Ovaries contain follicles, small structures holding egg cells at various stages of development. They also produce hormones, especially oestrogens and progesterone. Usually one mature egg cell is released during ovulation. Movement and cilia in the fallopian tube help transport it. Fertilisation by a sperm usually occurs in the fallopian tube. The early embryo then moves towards the uterus.
Hormones are signals released by glands and other organs that act on cells with specific receptors. Oestrogen and progesterone affect reproductive organs, the nervous system and mucous membranes, among other tissues. Their effects depend on concentration, target tissues and interaction with other signalling substances. It is therefore misleading to associate any hormone with one particular emotion, trait or performance level.
The hypothalamus is an area of the brain coordinating, among other things, hormonal signals. The pituitary is a small hormone-producing gland at the base of the brain. The hypothalamus sends gonadotropin-releasing hormone (GnRH) to the pituitary, which then releases follicle-stimulating hormone (FSH) and luteinising hormone (LH). These influence follicle development, ovulation and hormone production. Oestrogen and progesterone also send feedback signals to the brain, helping regulate the cycle.
Oestrogens and progesterone influence the nervous system because certain brain cells have receptors that respond to them. These hormones interact with signalling systems involved in sleep, temperature regulation, emotion and memory, among other things. Such biological mechanisms do not establish whether an individual will concentrate better or worse at work. Sleep, health, work demands, life circumstances and individual differences also affect experience and performance.
The nervous system receives and processes bodily signals including pain, temperature and changes in internal organs. Pain depends on activity in tissues and nerves and how the central nervous system processes signals. Sleep, illness, previous pain experiences and demands can all affect pain. This does not mean the pain is imagined or that all pain has the same cause.
Bodies function differently. Menstrual cycles, hormonal production and symptoms vary between people and across an individual's life. Medicines, hormonal contraception, pregnancy, illness and ageing can alter these processes. Severe, new or persistent symptoms should nevertheless be assessed for possible medical causes. Something being common does not mean a person has to live without help.
Understanding bodily functions helps explain why employees experience identical demands differently. Health problems can sometimes affect work ability, while the working environment can affect symptoms, recovery and the ability to remain at work.
Consider tasks, demands, functioning and individual needs. Provide managers and employees with reliable knowledge and enable conversations that respect privacy.
Biological differences do not justify assumptions about an individual employee's capacity, competence or needs. Working conditions require individual assessment.
Sources and further reading
The menstrual cycle is a regulated biological process involving the brain, ovaries and uterus. Cycle lengths and symptoms vary. To understand menstrual problems we need to consider both hormonal changes and processes in the uterus.
A menstrual cycle is counted from the first day of bleeding to the first day of the next period. A cycle is not necessarily 28 days, and ovulation does not automatically occur on day 14. The period before ovulation is especially variable. Hormonal contraception that suppresses ovulation may substantially change cycle patterns.
As progesterone and oestrogen fall towards the end of the cycle, parts of the uterine lining break down. Blood and tissue leave through the cervix and vagina. The uterus contracts to help expel the lining. Signalling substances called prostaglandins promote contractions. Higher levels or increased sensitivity may contribute to severe pain, nausea and other symptoms.
The follicular phase starts on the first day of bleeding. FSH helps ovarian follicles develop. Usually one becomes dominant and produces increasing amounts of estradiol, a type of oestrogen. The uterine lining is rebuilt. Changes occur gradually and hormone patterns can vary between cycles.
When estradiol levels have been sufficiently high, an LH surge can trigger ovulation. After ovulation the emptied follicle becomes the corpus luteum, which produces progesterone in particular. Progesterone affects the uterine lining and other bodily functions. Without pregnancy, the corpus luteum regresses, hormone levels fall and a new period begins.
Basal body temperature is measured at rest, ideally after uninterrupted sleep and at approximately the same time each morning. Progesterone often produces a small rise after ovulation. A sustained increase may indicate that ovulation probably occurred. Sleep loss, illness, alcohol and differing measurement times can alter readings. Temperature monitoring alone is not a reliable method of predicting ovulation or avoiding pregnancy.
Some people notice changes in energy, sleep, pain and concentration across the cycle. That does not mean everyone's cognitive ability follows a fixed pattern. A 2025 meta-analysis of 102 studies involving 3,943 participants found no robust, systematic differences in cognitive test performance between phases. This does not exclude substantial individual effects of PMS, PMDD, migraine, pain or poor sleep. Cognitive performance refers to tasks involving memory, attention and problem solving. Group averages and personal everyday experiences answer different questions.
Period pain is common, but severe pain preventing daily activities warrants assessment. New or noticeably changed pain, prolonged or heavy bleeding and bleeding between periods also warrant investigation. Causes can include endometriosis, adenomyosis, fibroids and other conditions. Investigation may enable treatment of an underlying cause.
Pain, nausea, sleep difficulties and heavy bleeding can affect work. Prolonged standing, limited toilets and lack of cover can worsen difficulties. There is no reason to assume everyone performs better or worse during a given phase.
Review toilet access, staffing, cover, breaks, ergonomic demands and flexibility. Adjustments should reflect individual needs, not stereotypes about menstruation.
Menstruation is a normal biological process, but severe or persistent symptoms may need treatment. Knowledge of the cycle is different from contraception.
Endometriosis is a chronic, oestrogen-dependent inflammatory condition involving tissue resembling the uterine lining outside the uterus. It can affect pain, digestion, urinary function, fertility and quality of life. Symptoms vary considerably.
Endometriosis lesions are usually found in the pelvis, including on the peritoneum, ovaries and tissues near the bladder and bowel. Ovarian cysts caused by the disease are called endometriomas. With deep endometriosis, lesions may infiltrate tissue beneath the peritoneum. Location and extent vary. Extensive visible lesions are not necessary for severe pain.
The causes are complex and not yet fully understood. One theory involves retrograde menstruation, where menstrual fluid moves backwards through the fallopian tubes into the abdominal cavity. This also occurs in many people without endometriosis and cannot explain the condition alone. Genetic factors, immune responses, hormones and local tissue processes are thought to contribute.
Endometriosis lesions can trigger local inflammation and release substances that affect pain receptors. Over time, the nervous system may become more sensitive to pain signals. Peripheral sensitisation refers to increased sensitivity of nerves in the body, while central sensitisation involves the spinal cord and brain processing pain signals more sensitively. Pain may therefore persist or become stronger even when visible endometriosis is limited. These are real biological mechanisms and help explain why symptoms and examination findings do not always correspond.
Endometriosis is commonly associated with severe period pain but can also cause pain between periods, during bowel movements or urination and during sex. Some experience bloating, nausea, digestive problems, lower-back pain or exhaustion. Pain may be cyclical, persistent or activity-related. Other possible causes of the symptoms should also be considered.
A GP can carry out an initial assessment and begin symptom-based treatment, referring to a gynaecologist if needed. Ultrasound and MRI can detect endometriomas and deep endometriosis, but normal imaging does not rule out superficial disease. Hormonal treatments that reduce or stop periods, pain relief and, in selected cases, surgery may be appropriate. Treatment should reflect symptoms, side effects, fertility goals and personal preferences.
Some have mild symptoms and function well with treatment, while others have considerable difficulties over time. The location of disease, nerve sensitivity, coexisting adenomyosis or other pain conditions may play a role. Responses to treatment also differ. It is therefore unhelpful to judge a person's symptoms by how others with the same diagnosis function.
Endometriosis can make prolonged standing, heavy lifting, long shifts, travelling or work with limited toilet access difficult. Pain and exhaustion may be unpredictable. Some need adjustments during certain periods, while others have longer-term needs.
Explore task variation, flexible work organisation, breaks, assistive equipment and planned follow-up. Focus discussions on functioning and working conditions. A diagnosis need not be shared with colleagues for practical measures to be considered.
Endometriosis is a medical condition. Normal imaging cannot rule out every form, and severe pain can occur even when visible changes are limited.
Sources and further reading
Adenomyosis is a benign condition in which glands and tissue resembling the uterine lining occur within the muscle wall of the uterus. It can cause severe pain and heavy bleeding. It is a separate condition, although it can coexist with endometriosis.
The uterus has an inner lining, the endometrium, and a thick muscular wall, the myometrium. The muscle allows the uterus to contract during menstruation and childbirth. In adenomyosis, glands and associated tissue resembling the uterine lining are found within this muscle wall. This may lead to local tissue changes, increased sensitivity and altered uterine contractions.
Adenomyosis can be associated with inflammatory reactions and changes within the uterine muscle. When the uterus contracts during menstruation, these changes may contribute to pain. Some also experience persistent pressure or tenderness in the pelvis. Symptoms range from almost absent to substantially disabling.
Adenomyosis can interfere with normal uterine function and contribute to heavy or prolonged bleeding. Repeated blood loss may deplete iron stores, causing iron deficiency and eventually anaemia, with fatigue, dizziness and reduced physical capacity. Both the bleeding and consequences of blood loss are therefore relevant in medical assessment.
With adenomyosis, changes occur within the muscular wall of the uterus. Endometriosis involves tissue resembling the endometrium outside the uterus. The conditions may cause similar pain but differ anatomically and can coexist. Symptoms alone are therefore not always enough to distinguish them.
Gynaecological assessment and ultrasound are often central to investigation. MRI may be useful when more detail is needed. A hormonal IUD is a common first-line option for troublesome symptoms. Other hormonal treatment, pain relief or surgery may be considered individually. Fertility plans and responses to previous treatment influence decisions.
Heavy bleeding, pain and possible iron deficiency can affect physically demanding work or jobs with limited breaks and toilet access. Medical assessments and appointments may also be needed.
Consider toilet access, cover, flexibility, task variation and reduced physical demands when needed. Follow-up should allow adjustments if symptoms or treatment change.
Adenomyosis is benign but can cause considerable pain, heavy bleeding and reduced quality of life. New or unusual bleeding should be medically assessed.
Sources and further reading
Heavy menstrual bleeding is more than a question of how often products need changing. Significant blood loss can affect iron stores, haemoglobin and physical capacity. It may also be a symptom of an underlying medical condition.
Blood loss varies naturally and is difficult to measure accurately at home. Heavy bleeding may involve frequent changes, soaking through clothes or bedding, large clots or prolonged bleeding. Effects on daily life are also important. Someone may need treatment even if the amount of blood loss has not been measured.
Iron is needed to make haemoglobin, the protein in red blood cells that carries oxygen. When bleeding causes more iron loss than the body replaces, iron stores may fall. Iron-deficiency anaemia can eventually develop, causing fatigue, dizziness, palpitations and reduced stamina.
Possible causes include adenomyosis, uterine fibroids, hormonal disturbances, certain contraceptive methods and disorders affecting blood clotting. Sometimes there is no clear structural cause. New bleeding problems must be assessed in light of age, symptoms, possible pregnancy and other risk factors.
A doctor may ask about duration, amount, pain and other symptoms. Blood tests can assess haemoglobin and iron stores. A gynaecological examination or ultrasound may be appropriate if uterine changes are suspected. Treatment depends on the cause, age, health conditions and pregnancy wishes.
Treatments may include medicines that reduce bleeding, hormonal options and treatment of the underlying cause. Iron supplements may be necessary for confirmed deficiency after medical assessment. The goal is to reduce symptoms, prevent complications and improve functioning and quality of life.
Frequent toilet visits, concern about leaks, pain and iron deficiency can make long meetings, lone working and physically demanding tasks difficult. Lack of toilet access or cover can increase the burden.
Provide suitable toilets, cover for breaks and appropriate break procedures. Explore flexibility and adjustments when someone has symptoms or is undergoing treatment.
Heavy bleeding is treatable. Very heavy bleeding with fainting, severe dizziness or clearly feeling unwell requires prompt medical assessment. Bleeding after menopause also needs investigation.
Sources and further reading
PMS, PME and PMDD can all cause considerable symptoms before menstruation, but describe different patterns. PMS and PMDD typically occur during a defined part of the cycle. PME involves worsening of an illness or condition that is also present at other times. This distinction matters because assessment, follow-up and treatment may differ.
Premenstrual syndrome (PMS) describes symptoms during the latter part of the cycle that usually ease after bleeding begins. These may include bloating, breast tenderness, headaches, tiredness, irritability or low mood. The term is especially relevant when symptoms affect daily life.
Research suggests that some individuals are more sensitive to ordinary hormonal changes after ovulation. This may involve how the nervous system responds to progesterone-related signalling substances. Symptoms can therefore be substantial even when routine hormone tests show normal values. The mechanisms are complex and remain under investigation.
Premenstrual dysphoric disorder (PMDD) is more severe, with particularly prominent psychological and emotional symptoms. These can include deep low mood, anxiety, irritability, mood swings or emotional overwhelm. Symptoms may significantly affect relationships, work and daily functioning and usually follow a clear cyclical pattern.
PME means that symptoms of an existing physical or mental health condition become noticeably worse before menstruation. For example, someone with migraine may experience more attacks, or someone with depression may experience more intense symptoms. The underlying condition is also present at other points in the cycle. PME therefore describes worsening of an existing condition rather than necessarily a separate condition beginning before every period.
With PMDD, characteristic symptoms occur mainly in the latter part of the cycle and usually ease shortly after bleeding begins. With PME, symptoms of an underlying condition occur elsewhere in the cycle too, with a noticeable worsening before menstruation. Both patterns can be serious and difficult to distinguish without systematic monitoring. Treatment aimed at PMDD may not adequately address PME, in which the underlying condition also needs assessment. Healthcare professionals should consider the full symptom pattern.
Daily symptom records over at least two menstrual cycles can show both when symptoms intensify and how the person feels during the rest of the month. This helps distinguish PMS and PMDD from PME, where an underlying condition produces symptoms outside the premenstrual phase. Records may include sleep, pain, mood, functioning and known disease symptoms. They help healthcare professionals assess the situation; a calendar alone does not establish a diagnosis.
Treatment depends on severity, symptom pattern and individual circumstances. Options may include everyday adjustments, psychological therapy, certain hormonal contraceptives or selective serotonin reuptake inhibitors (SSRIs), medicines affecting the neurotransmitter serotonin in the brain. Medical assessment is particularly important for severe mental health symptoms. Treatment should be tailored to each person's needs and circumstances.
Severe PMS, PME or PMDD can affect sleep, pain, concentration, emotional demands and working capacity. With PME, the underlying condition may also affect the rest of the month. Needs therefore vary between people and over time. Diagnoses or cycle phases do not justify assumptions about an individual employee's performance.
Offer confidential discussions about tasks, demands, support and practical needs. Consider clear priorities, protected work periods, breaks or flexibility where possible. Employees generally do not need to share detailed mental health symptoms with colleagues. Measures should be reviewed and adapted together with the employee.
PMDD and PME have different patterns requiring individual assessment. Call 113 in Norway if there is an immediate risk of suicide or serious self-harm.
Polyendocrine metabolic ovarian syndrome (PMOS) was previously known as polycystic ovary syndrome (PCOS). Metabolic refers to how the body processes and uses energy, while ovarian refers to the ovaries. The name change emphasises that the condition can affect several systems, including hormone regulation, metabolism, skin, fertility and mental health.
PMOS is a long-term condition with complex hormonal and metabolic features. Some have irregular or absent ovulation, increased androgen activity or changes in the ovarian follicle pattern. Androgens are hormones found in all sexes, though in different amounts. PMOS occurs in people of different body sizes, and not everyone experiences the same symptoms.
Insulin helps cells absorb and use glucose from the blood. Insulin resistance means cells respond less effectively to insulin, and the body may compensate by producing more. For some with PMOS, this affects androgen production and contributes to metabolic problems. PMOS is associated with increased risk of conditions such as type 2 diabetes and high blood pressure, making long-term follow-up relevant.
Hormonal changes can allow follicles to develop without regularly releasing an egg. Periods may become infrequent or unpredictable. Lack of ovulation can affect fertility, but does not mean pregnancy is impossible. Infrequent periods over a long period may also require assessment because hormonal patterns affect the uterine lining.
Increased androgen activity may contribute to acne, increased hair growth in certain areas or thinning scalp hair. Some also experience psychological strain relating to symptoms, bodily changes or fertility concerns. Distinguish possible biological mechanisms from the individual consequences of living with the condition.
Diagnosis is assessed through medical history, symptoms, blood tests and other investigations where relevant. Treatment may include regulating bleeding, monitoring metabolic risks, managing skin and hair symptoms or supporting pregnancy plans. Measures should reflect individual symptoms, health and goals. No single treatment suits everyone.
PMOS may indirectly affect work through symptoms, medical follow-up or psychological strain. Many people with PMOS are healthy and function without specific workplace adjustments. The diagnosis alone therefore says little about working capacity.
Make room for necessary medical appointments and specific adjustments when required. Avoid generalisations based on body size, hormonal diagnoses or fertility.
Helsenorge now uses PMOS as the new term. PCOS remains a widely recognised name for the same condition.
Sources and further reading
Fertility means the ability to achieve pregnancy. It depends on many biological factors, including ovulation, egg and sperm quality, fallopian tube function, uterine conditions and age. Medical assessment and treatment may be appropriate when pregnancy does not occur.
An egg must be released and be able to meet a sperm. Fertilisation usually occurs in a fallopian tube. The fertilised egg begins dividing, forming an early embryo that must then implant in the uterine lining. Disruption at one or more stages can affect the likelihood of pregnancy.
Egg cells form before birth, and their number decreases throughout life. Egg quality also changes with age, including a greater likelihood of chromosomal abnormalities. Fertility declines gradually and usually more noticeably after the mid-thirties. Age matters, but it is not the only reason for fertility challenges.
Assessment may include menstrual cycles, medical history, previous pregnancies and health conditions. Blood tests, ultrasound and semen analysis may be used. Some examinations assess fallopian tube function or conditions in the uterus. In some cases a clear cause is found, while others are diagnosed with unexplained infertility.
IVF means in vitro fertilisation, where fertilisation takes place in a laboratory. The person undergoing egg retrieval usually receives hormonal treatment to stimulate several follicles. Eggs are collected and fertilised outside the body. An embryo may later be transferred to the uterus. Treatment requires medical follow-up and results vary.
Appointments and procedures often need to match hormonal responses and egg development, making advance planning difficult. Some experience medication side effects, discomfort after egg retrieval or emotional strain related to uncertainty and results. Others find treatment less demanding. There is no single typical experience.
Treatment may include medicines to stimulate ovulation, insemination, IVF or other options depending on the cause and circumstances. Access to treatment and financial support is governed by Norwegian schemes. Medical assessment and information about options, risks and expected outcomes are important for informed decisions.
Fertility treatment may require short-notice appointments, medical procedures and recovery. Some experience psychological strain. Flexibility may therefore be especially important at work.
Explore flexible schedules, practical adjustments and confidential dialogue. Leave and pay must be assessed under applicable rules, collective agreements and individual circumstances.
There is no automatic general right to paid time off for every fertility appointment. Employers do not necessarily need details of treatment to discuss practical arrangements.
Sources and further reading
Pregnancy involves extensive physiological changes that support fetal development. At the same time, certain workplace conditions can put the pregnant employee or fetus at risk. Distinguish common pregnancy symptoms from hazards relating to the work itself.
Early in pregnancy, human chorionic gonadotropin (hCG), a hormone produced early in pregnancy, helps maintain progesterone production. The placenta later takes on an important role in hormone production. It serves as an exchange organ between the pregnant person and the fetus, supplying oxygen and nutrients and removing waste products. Some chemicals and medicines can also cross the placenta.
During pregnancy blood volume rises, and the heart pumps more blood to meet the needs of both pregnant person and fetus. Blood pressure and circulation may change. Some experience dizziness, palpitations or greater fatigue. These can have normal explanations, but new or severe symptoms require medical assessment.
The body's centre of gravity, posture and distribution of physical strain change gradually. Hormonal and mechanical factors may affect the pelvis, back and joints. Some develop pelvic pain or find heavy lifting and prolonged standing harder. Pregnancy does not automatically mean reduced physical capacity, and needs should be assessed individually.
An exposure is something encountered through work. Certain chemicals, infectious agents, radiation, heavy physical demands and other factors may require special assessment during pregnancy. Risk depends on the substance or hazard, amount, duration and stage of pregnancy. Employers must therefore examine actual conditions rather than rely on general assumptions.
Employers must identify possible hazards and implement necessary measures. For pregnant employees this may mean changing tasks, hours, equipment or work location. If risk cannot be removed through adjustments, other suitable work should be considered. Occupational health services can assist with specialist assessment where available.
Pregnancy benefits may apply where work poses a risk to the fetus and adjustments or reassignment are impossible. Sickness benefits apply to illness or medically justified inability to work. These are separate schemes with different eligibility rules. NAV and healthcare professionals can advise which is relevant.
Pregnancy symptoms and workplace hazards can affect work in different ways. Some need adjustments because of nausea, pain or fatigue. Others need different tasks because particular exposures are hazardous even if they feel well.
Conduct risk assessments early, examine actual exposures, involve the pregnant employee and document necessary measures. Workplace adjustments and reassignment must be considered under current working environment rules.
Workplace risks during pregnancy may exist without symptoms. Prevention should therefore be based on knowledge of exposures, not on whether the pregnant employee feels unwell.
The pelvic floor consists of muscles and connective tissue that support organs in the pelvis and help regulate urination, bowel movements and sexual function. Problems can arise after childbirth or at other points in life.
The pelvic floor muscles form a supporting structure at the bottom of the pelvis. Together with connective tissue and nerves, they help hold the bladder, uterus and bowel in place. The muscles contract to help maintain continence and relax during urination and bowel movements. Good function therefore involves strength, coordination and the ability to relax.
Pregnancy increases the demands on pelvic floor muscles and support tissues. Vaginal birth may cause major stretching and sometimes injury to muscles, nerves or connective tissue. People who give birth by caesarean section can also have pelvic floor symptoms. Recovery varies with strain, possible injuries and individual circumstances.
Stress incontinence is urinary leakage when abdominal pressure rises, for example during coughing, laughing, lifting or exercise. Here 'stress' means mechanical pressure rather than psychological stress. Leakage may result from reduced support around the urethra or changes in pelvic floor function. Pelvic floor training and other treatment help many people.
Pelvic organ prolapse means one or more pelvic organs descend from their normal positions. This may cause heaviness, pressure or a bulge in the vagina. Some also have difficulty emptying their bladder or bowel. There are different degrees of prolapse, and symptoms do not always correspond directly to anatomical changes.
Recovery after birth involves more than the healing of visible wounds. Hormones, sleep, nutrition, muscle function, pain and caregiving demands may affect functioning. Some have few difficulties, while others need longer follow-up. Persistent pain, leakage or heaviness may warrant medical assessment and physiotherapy from a pelvic floor specialist.
People who breastfeed or express milk after returning to work may need time, suitable facilities and predictable schedules. The Working Environment Act provides a right to breastfeeding breaks; entitlement to pay depends on statutory conditions and any more favourable collective agreement. Practical arrangements should be discussed early.
Heavy lifting, prolonged standing and limited toilet access may be difficult with certain pelvic floor symptoms. Some also need adjustments for breastfeeding, expressing milk or medical follow-up. Needs may change during recovery.
Consider assistive equipment, task variation, toilet access, breaks and suitable breastfeeding facilities. Agree on follow-up and adjust measures when needed.
Urinary leakage, pain and prolapse can be treated or relieved. Persistent symptoms should be assessed by healthcare professionals rather than dismissed as an inevitable consequence of childbirth.
Menopause is a process, not a fixed list of symptoms. Learn how hormones change in perimenopause, at menopause and afterwards, why some people experience brain fog or other symptoms, what research can tell us, and how health and working conditions can be supported without generalisations.
Perimenopause refers to the years around the last menstrual period and begins while periods may still occur. The number of ovarian follicles gradually falls, ovulation becomes less predictable, and estradiol levels in particular can fluctuate significantly between months. Progesterone may be lower in cycles without ovulation. Shorter and longer cycles, heavier bleeding and periods with few symptoms may alternate with weeks of hot flushes, sleep problems or anxiety. A single hormone measurement usually cannot capture these fluctuations.
Menopause means the final menstrual period. In natural menopause, it can usually be identified only after twelve consecutive months without bleeding, once other explanations have been considered. The average age is in the early fifties, with wide variation. Hormonal contraception affecting bleeding, hysterectomy and certain medical treatments can make periods an unreliable indicator. For people over 45, assessment is generally based on age, symptoms and medical history rather than one isolated hormone test.
Postmenopause is the period after the final menstrual period. Ovaries usually produce much less estradiol, creating a different hormonal environment from the years of regular periods. Hot flushes may ease for some but persist for many years in others. Vaginal, vulval and urinary symptoms can persist or develop later. This life stage also matters for bone health and general preventive healthcare. The number of years since the last period cannot tell us how an individual feels.
Brain fog is an everyday term for perceived difficulty thinking clearly. Someone may lose their train of thought mid-sentence, struggle to recall a familiar word, need longer to retrieve information, forget what they intended to do or find multitasking more demanding. This may be especially noticeable in meetings, complex documentation or work with frequent interruptions. Brain fog describes an experience; it is not itself a diagnosis or proof of dementia.
Memory includes several functions. Working memory helps us keep information active while using it, for example when following several spoken instructions. Attention lets us maintain focus or switch between tasks. Learning involves taking in new information, while word retrieval involves accessing familiar language. Brain fog can involve one or more of these functions. Poor sleep, stress, pain and interruptions can affect them, including outside menopause.
Oestrogens act on receptors in brain regions involved in memory and attention, among other things, so hormonal changes may contribute. Night sweats can disrupt sleep, while persistent pain, psychological strain and other health factors may affect concentration. It is difficult to isolate one cause in an individual. A professional assessment should therefore examine menopause-related symptoms and other explanations rather than automatically attributing every lapse of memory to hormones.
Many people report memory and concentration problems during perimenopause. Cognitive testing studies also find differences between some groups, but results vary by measurement method, comparison group and definitions of menopausal stages. A systematic review and meta-analysis published online in 2025 included 26 articles with 9,428 participants and found weaker cognitive test performance during perimenopause than before menopause overall, especially in studies using standardised staging. These are group averages, not predictions of any individual's trajectory. Perceived brain fog does not automatically mean permanent cognitive decline.
Contact your GP if concentration or memory problems are new, persistent, clearly worsening or affecting everyday function. Assessment may cover sleep, medicines, mental health, thyroid function, haemoglobin and other causes. Sudden confusion, language problems or paralysis need urgent attention: call 113 in Norway if you suspect stroke. Menopause is one possible factor, not an automatic explanation for new neurological symptoms.
Hot flushes are sudden sensations of heat, often accompanied by flushing, sweating and sometimes palpitations. Hormonal changes affect temperature-regulating brain networks, so small changes in body temperature can more readily trigger heat and sweating. At night, this may cause waking and the need to change clothing or bedding. Symptoms range from mild to severe and do not affect everyone. Treatment and practical measures can be considered when quality of life is affected.
During menopause, night sweats can disrupt sleep, but so can anxiety, pain, altered sleep rhythms or other sleep disorders. Some struggle to fall asleep, while others wake frequently or too early. Insufficient sleep can cause fatigue, irritability, lower stress tolerance and problems with working memory and concentration. Persistent problems warrant an assessment of causes, including sleep apnoea where relevant. Adjustments supporting recovery and predictable work schedules may help.
Some experience stronger emotional fluctuations, irritability, anxiety or low mood during the menopausal transition. Hormonal changes may play a role, but sleep, life events, previous mental health concerns, work pressure and other stresses may contribute. Symptoms need individual assessment; depression or anxiety disorders should not be dismissed as normal hormonal reactions. Seek help promptly for serious low mood or suicidal thoughts, and call 113 if danger is immediate.
Oestrogen affects various tissues, and some experience more aches, stiffness or joint pain during menopause. Age, physical demands, sleep, other illnesses and activity levels can contribute at the same time. Muscle strength and mass also change through adulthood, not solely due to menopause. Varied activity, resistance training and adequate recovery can be helpful when adapted to health. New, severe or persistent pain deserves assessment, especially with swelling, fever or significant loss of function.
Palpitations may accompany hot flushes or occur separately. Some also report dizziness, headaches or exhaustion beyond ordinary tiredness. Causes can be complex; sleep deprivation, iron deficiency following heavy bleeding, thyroid disease and heart rhythm disorders are examples of alternative explanations. Repeated or concerning palpitations should be discussed with a doctor. Palpitations with chest pain, shortness of breath or fainting need urgent assessment, and serious acute symptoms may require calling 113.
Lower oestrogen levels after menopause can make the tissues of the vagina, vulva and parts of the urinary tract thinner and more vulnerable. Some develop dryness, burning, pain with sex, frequent urination, urinary leakage or recurrent urinary infections. These are collectively known as genitourinary symptoms of menopause and can persist without treatment. Local oestrogen or other measures may help depending on symptoms and medical assessment. Relationships, pain, mental health and circumstances also affect sexuality.
During perimenopause, ovulation may become less frequent and periods irregular. Some experience longer gaps, others more frequent or heavier bleeding. Heavy or prolonged bleeding, bleeding between periods and bleeding after sex may have several causes and require assessment. Any bleeding after natural menopause has been established must be investigated, even if slight. Very heavy bleeding with dizziness or fainting requires prompt medical assessment.
Bone tissue is continuously broken down and rebuilt. When oestrogen falls around menopause, bone breakdown may increase, especially in the early years. Over time this can contribute to lower bone density and higher risk of osteoporosis and fractures. Individual risk also depends on age, heredity, previous fractures, medicines and lifestyle. Resistance and weight-bearing activities, adequate nutrition and risk assessment are relevant. Doctors may recommend bone density testing for higher-risk individuals; not everyone needs a scan.
Around and after menopause, lipid profiles—the levels and distribution of fats such as cholesterol and triglycerides in the blood—and body composition often change. Cardiovascular risk increases with age, influenced by biology and factors such as blood pressure, smoking, diabetes and physical activity. Menopause alone does not explain an individual's risk. Prevention involves overall risk assessment and tailored advice. Hormone therapy should not be started solely to prevent cardiovascular disease or dementia.
When the final period occurs between ages 40 and 45 it is called early menopause. Loss of ovarian function before age 40 may reflect premature ovarian insufficiency (POI), which requires separate investigation and follow-up. Causes may include genetic factors or medical treatments but are often unknown. Effects on fertility, bones and cardiovascular health may differ from menopause at the usual age. Seek healthcare if early menopause or POI is suspected.
When symptoms affect daily life, a GP or gynaecologist can assess the symptoms, bleeding pattern and possible alternative causes. Systemic menopausal hormone therapy is effective for hot flushes and night sweats and may indirectly improve functioning if sleep improves. Benefits, risks, route of administration and the need for progestogen depend on age, presence of a uterus, medical history and preferences. Local treatment can be particularly helpful for genital symptoms. Non-hormonal options and individual coping measures also exist. Hormone therapy is not an established specific treatment to improve memory in otherwise healthy people.
Employees can describe difficulties at work and practical changes that might help without sharing detailed diagnoses with colleagues. For concentration problems, agreed interruption-free periods, written priorities or meeting summaries may be useful. For hot flushes, temperature, clothing and breaks may be more important. Employers must assess working conditions and appropriate adjustments individually. Measures should be evaluated with the employee without assuming all people of a certain age have the same needs.
Brain fog, broken sleep, pain, night sweats, palpitations or heavy bleeding may make concentration-intensive tasks, customer-facing roles, night shifts, working in hot protective clothing and jobs without breaks harder for some. Others have few or no difficulties. Work ability cannot be inferred from sex, age or menopausal status; it must be considered alongside symptoms, tasks and working conditions.
First examine working conditions: interruptions, staffing, opportunities for focused work, meeting frequency, temperature, clothing, cover, toilet access, scheduling and recovery. With the employee, consider limited trials such as written summaries, clear priorities, flexible breaks or a cooler workspace. Agree on review and adjustment. Employers should not request unnecessary health information or make hormone therapy a condition of workplace adjustments.
Brain fog describes perceived cognitive problems, not a diagnosis. New or persistent symptoms deserve individual assessment, and bleeding after menopause must be investigated. Hormone therapy can help certain symptoms but does not guarantee improved concentration. Workplace adjustments should be based on needs and work conditions, not assumptions.
Sources and further reading
Occupational health concerns how work itself affects health. The working environment includes organisational, psychosocial, ergonomic, chemical and biological conditions, among others. Several risk factors may occur together and interact.
Working capacity means being able to carry out the tasks a job requires within a particular organisational setting and using the resources available. The same health problem may matter differently at a workplace with reliable cover, flexible breaks and predictability than in lone working with high time pressure and little task variation. Measures that improve conditions can therefore help participation even when symptoms persist. Assess actual functioning rather than assuming effects based on diagnosis, age or sex.
The working environment is more than job satisfaction and interpersonal relationships. It includes how work is planned and organised, the tasks carried out, demands imposed, and physical or chemical exposures. A working environment may contain factors that promote or harm health.
Heavy lifting, repetitive movements, awkward positions and prolonged standing may increase musculoskeletal risk. Risk depends on force, duration, repetition, work pace and opportunities for variation and rest. Ergonomics therefore means more than sitting correctly: equipment, work organisation and task execution matter too.
The psychosocial working environment concerns how work is organised and performed, as well as social aspects. Section 4-3 of the Norwegian Working Environment Act includes unclear or conflicting expectations, emotional demands from working with people, workloads and time pressures out of proportion to available time, and help and support. Violence, threats and harassment must also be prevented. From 1 January 2026, existing duties were clarified in the Act and chapter 1A of the Regulations on the Performance of Work. Employers must identify relevant risks, assess factors individually and together, involve employees and representatives, document assessments and implement necessary measures. The rules are not a universal checklist requiring identical risk assessments in every workplace.
Night work, long shifts and unpredictable hours may affect sleep and circadian rhythms. Inadequate recovery can affect physical and mental capacity. For people with existing health problems, sleep disruption may make symptoms harder to manage. Not all sleep problems are caused by work, but working time arrangements are an important part of risk assessment.
The Norwegian labour market is gender-segregated, with women and men distributed differently across many occupations and industries. This may create different patterns of occupational exposure. NOU 2025:5 highlights combined emotional and ergonomic demands in female-dominated occupations. Women's health is nevertheless relevant in every sector. In male-dominated workplaces, for example, protective equipment, work methods and chemical exposures may require particular attention. Risk must always be assessed based on actual working conditions, regardless of workforce gender balance.
Systematic workplace health and safety work involves identifying hazards, assessing risk, implementing measures and evaluating effects. Prevention should, as far as possible, reduce risks at source. Individual adjustments may also be necessary, but do not replace employers' duty to provide a safe environment for everyone.
Psychological safety means people feel able to ask questions, express uncertainty and raise concerns without humiliation or negative interpersonal reactions. When health problems arise, this can make it easier to request support early. Otherwise some may stay silent for fear of being seen as unambitious or unreliable. Psychological safety is compatible with employers setting reasonable demands and assessing measures against organisational needs and legal requirements.
Pain, exhaustion or other symptoms may affect work long before healthcare professionals identify a cause. Investigation can take time for some conditions, including endometriosis. Nevertheless, workplaces can discuss difficult tasks, contributing working conditions and arrangements to try. Conversations about practical adjustments generally do not need to begin with a full account of medical details. Specific rights and duties depend on the law and circumstances.
Some continue working through severe pain or exhaustion because they fear losing tasks, seeming less competent or burdening colleagues. Others try to compensate by working extra when they feel better. Working while unwell is sometimes called sickness presenteeism; it has different causes and consequences and is not automatically harmful. Prevention means looking for unrealistic demands, inadequate staffing, insufficient cover and norms that make requesting help difficult.
An employee can be highly skilled while also needing flexibility or recurring adjustments. If leadership opportunities, courses and promotions are judged mainly by attendance, unnecessary barriers may arise. Some tasks require physical presence, but these requirements should be justified. Employers should also apply objective, transparent criteria to skills, results and development. Section 4-2 of the Working Environment Act covers professional and personal development; anti-discrimination protection is assessed separately in individual cases.
ISO 45010:2026 provides guidance on menstruation and menopause in the workplace. It can help organisations review work organisation, facilities, management and practical measures. The standard is advisory and does not itself introduce new Norwegian legal duties. It does not cover all women's health, so it must be used with Norwegian law and other professional knowledge.
Health and working conditions affect each other. Pain, sleep problems or other symptoms can have different consequences depending on tasks, staffing, support and flexibility. Pressure to hide needs or compensate through extra work can increase strain. Good organisation and early dialogue can help people use and develop their skills over time.
Employers should map demands, involve employees and safety representatives, prioritise measures reducing risks at source and monitor effects. Managers should respond respectfully to needs even before diagnosis and protect confidentiality. HR, HSE and occupational health services can assist, while employers retain responsibility. Review whether practices provide fair training and development opportunities.
Good working environment management combines health knowledge, preventing harmful demands, psychological safety and real opportunities for participation and development. Measures must reflect actual conditions and be evaluated over time.
Sources and further reading
Look up a term
The chapters explain the broader context. Here are short definitions to return to when you encounter unfamiliar words. Glossary terms are also included in the search at the top of the page.
A condition where tissue resembling the uterine lining is found within the uterine muscle wall. May cause pain and heavy bleeding.
A group of hormones present in all sexes. They can affect skin, hair growth and reproductive functions.
Body temperature measured at rest. It often rises slightly after ovulation due to progesterone.
Occupational health service (BHT), a specialist service supporting organisations with preventive working environment and health measures.
An everyday term for perceived problems with concentration, memory and finding words, among other things. Not a distinct diagnosis.
An ovarian cyst that may develop with endometriosis.
A chronic condition where tissue resembling the uterine lining occurs outside the uterus and may contribute to pain and inflammation.
The uterine lining inside the uterus. It builds up and changes through the menstrual cycle.
An important form of oestrogen produced by the ovaries, among other tissues, that varies throughout the menstrual cycle.
The ability to achieve pregnancy. It depends on factors including ovulation, sperm, fallopian tubes, uterus and age.
A small structure in an ovary containing an immature egg cell and supporting cells.
Follicle-stimulating hormone. Released by the pituitary gland and supports development of follicles in the ovaries.
Symptoms involving the genitals and urinary tract. During menopause these may include dryness, burning and urinary symptoms.
Gonadotropin-releasing hormone. A signal from the hypothalamus to the pituitary that helps regulate FSH and LH.
Human chorionic gonadotropin. A hormone produced early in pregnancy that helps maintain progesterone production.
A protein in red blood cells that carries oxygen around the body. Iron is required for its production.
Health, safety and environment. Systematic work to prevent injury and harmful demands and provide safe working conditions.
A small hormone-producing gland beneath the brain that releases FSH and LH, among other hormones.
An area of the brain coordinating bodily signals and influencing hormone production, temperature and other functions.
When the body's cells respond less effectively to insulin, often requiring more insulin to regulate blood sugar.
Mental processes involved in thinking, learning, remembering, paying attention and solving problems.
Luteinising hormone, released by the pituitary. A marked LH surge can trigger ovulation.
The phase after ovulation. The corpus luteum produces progesterone in particular.
The final menstrual period. In natural menopause, it is usually confirmed after twelve months without menstruation.
The thick muscular wall of the uterus that contracts during menstruation and childbirth, among other times.
Osteoporosis, a condition in which bones become more vulnerable to fractures.
The transition before and around the final menstrual period, when hormone production and bleeding patterns often become more irregular.
Premenstrual dysphoric disorder. Severe cycle-related psychological symptoms that typically ease shortly after menstruation begins.
Premenstrual exacerbation: symptoms of an existing condition become substantially worse before menstruation.
PMOS is a newer Norwegian term used by Helsenorge for the condition formerly called PCOS. It can affect hormones, ovulation and metabolism.
Premenstrual syndrome. Physical or emotional symptoms that typically occur before menstruation and ease afterwards.
Premature ovarian insufficiency. Reduced ovarian function before age 40, requiring medical assessment.
Local signalling substances that, among other things, cause the uterus to contract and can contribute to period pain.
A working environment where employees feel able to ask questions, report mistakes and express needs without fear of humiliation.
Increased sensitivity of pain receptors or the nervous system's processing of pain signals.
Being present and working despite having health problems. Causes and consequences vary.
Selective serotonin reuptake inhibitors, medicines affecting serotonin that are used for some mental health conditions.
Urinary leakage caused by increased abdominal pressure, for example when coughing, laughing or lifting.
Changes to tasks, organisation, equipment or working hours to prevent strain and make work possible under the circumstances.
Hot flushes and night sweats that can occur when menopause changes temperature regulation in the brain.
The ability to hold information briefly while using it, for example when following an instruction.
Explore further
Learn how hormones, ovulation and basal body temperature usually change over a menstrual cycle. Start with Tidlignok's explanations or explore the interactive hormone and temperature curves on Prevensjonsprat.
These curves illustrate patterns. Cycle phases do not tell us how any individual will feel or function at work.
Check your knowledge
Open the questions to see explanations.
During menstruation, prostaglandins are released and contribute to uterine contractions. Severe pain can also be caused by endometriosis or adenomyosis.
No. Endometriosis involves tissue resembling the uterine lining outside the uterus. Adenomyosis involves glands from the uterine lining within the uterine muscle wall. They can coexist.
Yes. PMOS is the name Helsenorge now uses for the condition previously called PCOS. It highlights that several body systems may be affected.
Yes. Certain chemical, biological and physical exposures need assessment even if the pregnant employee feels well.
No. Symptoms and functioning vary considerably. Employers should start with the individual's actual work situation and needs.
With PMDD, symptoms arise mainly before menstruation and ease shortly after it begins. With PME, an existing illness or condition worsens before menstruation while symptoms are also present at other times.
No. Studies have not found robust general differences in cognitive testing between cycle phases. Individuals may still experience significant symptoms, for example from pain, PMDD or sleep difficulties.
Working conditions and needs can be raised early. Employers can assess practical solutions based on functioning. Specific rights and documentation requirements depend on the circumstances.
Skills, results and relevant work requirements should be assessed individually. Automatically equating sickness absence with lower competence can create barriers, and anti-discrimination questions must be assessed under current rules.
No. ISO 45010:2026 is a guidance standard on menstruation and menopause in the workplace. Legal duties follow Norwegian law.
Explore conversations, adjustments and systematic working environment management according to your role.
Transparency about the content
Womanhood Initiative is responsible for Tidlignok content. Last content update: 14 October 2026. The date indicates an editorial update, not independent medical approval.
Medical topics draw primarily on public health sources and relevant scientific publications. The workplace section draws on Norwegian law, guidance from the Norwegian Labour Inspection Authority and occupational health research. We distinguish research, recommendations and legal requirements, and identify uncertainty where it exists.
We welcome professional input and specific feedback. Please tell us which chapter it concerns, what should be checked and any supporting sources.
Send feedback to hei@womanhood.noMedical explanations draw particularly on Helsenorge and professional guidelines. Workplace examples draw on guidance from the Norwegian Labour Inspection Authority, NOU 2025:5 and international occupational health research. ISO 45010:2026 offers guidance on menstruation and menopause at work. It is voluntary and does not itself introduce new legal requirements in Norway.
Research may reveal associations without proving cause and effect. When applying knowledge to workplace measures, consider the research, actual tasks and circumstances of the organisation.
This content provides general information. Individual health problems or legal questions require assessment based on the circumstances by appropriate professionals or authorities.