Clinical Guides
Amenorrhoea
A structured guide to primary and secondary amenorrhoea, emphasising pregnancy exclusion, axis-based diagnosis, cause-specific management and transparent limits for Indian practice.
MedNext Academy | 14 min read
Amenorrhoea
A structured guide to primary and secondary amenorrhoea, emphasising pregnancy exclusion, axis-based diagnosis, cause-specific management and transparent limits for Indian practice.
Summary
Amenorrhoea is absent or abnormally ceased menstruation. It is a presentation, not a final diagnosis. Primary amenorrhoea requires evaluation when menstruation has not occurred by age 15 despite normal secondary sexual development, within five years of breast development when that began before age 10, or when breast development has not begun by age 13. Secondary amenorrhoea requires evaluation after more than three months without menses in someone whose cycles were regular, or six months when cycles were previously irregular. Pregnancy can be present after a much shorter delay and must be considered first whenever possible.
Normal menstruation depends on an intact hypothalamus, pituitary, ovary, uterus and outflow tract. A useful diagnostic model therefore asks whether the problem is physiological, hypothalamic, pituitary, ovarian, uterine or outflow-related. Common causes include pregnancy, polycystic ovary syndrome, hyperprolactinaemia, thyroid disease, functional hypothalamic amenorrhoea, premature ovarian insufficiency and anatomical abnormalities. Lactation and menopause are physiological contexts, while medicines and systemic illness can disrupt several levels of the axis.
The history, secondary sexual characteristics, examination, pregnancy testing, thyroid-stimulating hormone, prolactin, follicle-stimulating hormone and estradiol identify or direct most causes. Pelvic ultrasound clarifies uterine anatomy, endometrium and ovaries. Further testing is selected from the emerging pattern rather than ordered as a universal panel.
Management treats the cause and protects health: restore energy availability in functional hypothalamic amenorrhoea, manage endocrine disease, provide endometrial protection when chronic anovulation exposes the endometrium, address oestrogen deficiency and bone risk, and offer fertility counselling without false reassurance. Urgent neurological, haemodynamic, pregnancy-related or eating-disorder complications take priority. This draft is educational and has been reviewed by the MedNext Clinical Team.
How Common Is It?
ASRM estimates that amenorrhoea unrelated to pregnancy, lactation or menopause affects approximately three to four percent of the population studied in older epidemiological sources. That figure should be interpreted cautiously: definitions, age distribution, contraceptive use, nutrition, chronic disease and access to evaluation differ between populations and over time. Primary amenorrhoea is much less common than secondary amenorrhoea and is enriched for anatomical, genetic and gonadal causes in specialist clinics.
The health burden is not captured by frequency alone. Amenorrhoea may be the first visible sign of pregnancy, energy deficiency, endocrine disease, ovarian insufficiency, uterine scarring or an outflow anomaly. It can affect fertility, bone health, endometrial health, cardiovascular risk, sexual well-being and psychological health depending on the cause and duration. Conversely, expected amenorrhoea during pregnancy, lactation or use of some hormonal methods may not require treatment when the context is clear and dangerous alternatives have been excluded.
Indian prevalence cannot be inferred reliably from a fertility clinic, medical-college series or a global estimate. Undernutrition, eating disorders, intensive exercise, obesity, PCOS, postpartum pituitary injury, genital tuberculosis and barriers to confidential adolescent care may have different relevance across settings, but this guide does not claim national rates for any cause.
For practice and examinations, the important lesson is threshold and consequence: evaluate delayed puberty or absent menarche at the recommended ages, exclude pregnancy promptly after a missed period when relevant, and investigate persistent secondary amenorrhoea before long-term hypo-oestrogenism or unopposed endometrial exposure is ignored.
Risk Factors
Risk factors should be organised along the reproductive axis. Functional hypothalamic amenorrhoea is more likely with low energy availability, restrictive eating, rapid weight loss, intense exercise, psychological stress, sleep disruption or chronic illness. Body weight alone is an incomplete screen: a person can have energy deficiency at a range of body sizes. Ask about eating behaviour, exercise, fractures, perfectionism, mood and stress without moral judgement.
Pituitary or hypothalamic disease is suggested by severe or persistent headache, visual change, galactorrhoea, polyuria or polydipsia, cranial irradiation, head injury, infiltrative disease or other pituitary-hormone symptoms. Postpartum haemorrhage followed by lactation failure and amenorrhoea raises concern for Sheehan syndrome. Medicines that increase prolactin, including several antipsychotic and antiemetic drugs, should be reviewed, but essential treatment must not be stopped abruptly.
Ovarian causes include PCOS, autoimmune disease, genetic or chromosomal conditions, chemotherapy, pelvic radiotherapy and ovarian surgery. Premature ovarian insufficiency means loss of ovarian activity before 40 and may be intermittent; amenorrhoea does not prove irreversible sterility. Hyperandrogenism suggests PCOS or non-classic congenital adrenal hyperplasia, while rapid virilisation raises concern for an androgen-secreting tumour.
Primary amenorrhoea with cyclic pain suggests outflow obstruction. Absent uterus or a short vagina changes the anatomical differential and requires sensitive specialist assessment. Secondary amenorrhoea after curettage, uterine surgery, endometrial ablation or severe uterine infection suggests intrauterine adhesions. In India, genital tuberculosis remains a selected risk-based consideration rather than a universal explanation or screening test.
Diagnosis
Use an axis-based, stepwise approach. Confirm whether the timing meets a primary or secondary evaluation threshold, but do not delay pregnancy testing when conception is possible. Identify emergencies and severe systemic illness first. Tests should answer a clinical question, and normal results should be interpreted with cycle history, hormonal medicines and anatomy.
History
Document age at breast development and pubic hair, menarche and previous cycle pattern, last menstrual period, pregnancy possibility, contraception and lactation. Ask about weight and dietary change, exercise, stress, chronic illness, hot flushes, vaginal dryness, acne, hirsutism, rapid virilisation, galactorrhoea, headache, vision, smell, thirst, urination, pelvic pain and cyclic pain without bleeding. Review fractures, uterine procedures, postpartum haemorrhage, cancer treatment, infection risk, medicines and family history of delayed puberty, early menopause or genetic disease. Ask fertility goals and emotional impact.
Examination
Assess vital signs, orthostasis, height, weight trajectory and general nutrition. Examine secondary sexual characteristics, thyroid, skin, acne, hirsutism, virilisation, galactorrhoea and visual fields when indicated. Abdominal and external genital examination can assess a mass, outflow obstruction and anatomy. Internal examination is not automatic; obtain consent, consider age and sexual history, use a chaperone and select ultrasound when examination is declined or unsuitable. Severe bradycardia, hypotension or orthostasis in suspected energy deficiency needs urgent escalation.
Investigations
Exclude pregnancy first, using serum hCG when a false-negative urine result would be consequential. Initial endocrine tests usually include TSH, prolactin, FSH and estradiol; LH can aid pattern recognition. Pelvic ultrasound assesses presence of uterus, endometrium, ovaries and structural disease. Add total testosterone and DHEAS with hyperandrogenism and 17-hydroxyprogesterone when non-classic congenital adrenal hyperplasia is suspected. Persistently elevated prolactin requires medicine and physiological review and often pituitary evaluation. Primary amenorrhoea may require karyotype, testosterone, renal imaging or MRI according to breast development and uterine anatomy. AMH can support selected questions but is not routinely necessary. Bone-density assessment is considered with prolonged hypo-oestrogenic amenorrhoea or earlier skeletal risk. A progestin-withdrawal test is not a stand-alone diagnosis because both false-positive and false-negative interpretations occur.
Differential Diagnosis
Begin with physiological and iatrogenic explanations: pregnancy, lactation, menopause and menstrual suppression from hormonal contraception. A contraceptive method can explain amenorrhoea, but pregnancy testing is still needed when use was imperfect, symptoms are concerning or the method could have failed. Hysterectomy or endometrial ablation changes the meaning of absent bleeding.
Hypothalamic causes include functional hypothalamic amenorrhoea from energy deficit, exercise or stress; congenital gonadotrophin-releasing hormone deficiency; tumour, trauma, infection or infiltrative disease. Pituitary causes include hyperprolactinaemia, prolactinoma, other sellar lesions and postpartum hypopituitarism. Thyroid and adrenal disorders can disrupt the axis.
Ovarian causes include PCOS, premature ovarian insufficiency, gonadal dysgenesis, resistant ovary and treatment-related ovarian damage. PCOS generally combines ovulatory dysfunction with clinical or biochemical hyperandrogenism and/or polycystic ovarian morphology under the applicable adult criteria; ultrasound appearance alone is not diagnostic. POI before 40 requires biochemical confirmation and a structured cause and health assessment. Rapid virilisation demands exclusion of an ovarian or adrenal androgen-secreting tumour.
Uterine and outflow causes include Müllerian agenesis, complete androgen insensitivity, imperforate hymen, transverse vaginal septum, cervical obstruction and intrauterine adhesions. Cyclic pain with primary amenorrhoea points toward obstruction until evaluated. Secondary amenorrhoea after uterine instrumentation suggests adhesions. Genital tuberculosis can scar the endometrium or outflow tract in selected Indian patients, but testing must follow exposure, symptoms, imaging and specialist judgement.
Systemic disease, malnutrition, coeliac disease, diabetes, kidney or liver disease and medications complete the differential. The laboratory pattern localises the axis; it does not replace clinical context.
Management
Management is cause-specific and should not aim merely to create a withdrawal bleed. Explain the working diagnosis, uncertainty, health implications, fertility relevance and what follow-up will test. Pregnancy receives the appropriate antenatal or pregnancy-complication pathway. A structural obstruction, tumour, severe endocrine disorder or systemic illness requires timely specialist care.
For functional hypothalamic amenorrhoea, correct the energy imbalance through increased nutrition, reduced excessive exercise and behavioural change; weight gain is often necessary. Offer dietetic and psychological support, including treatment for an eating disorder where present. The Endocrine Society advises against using combined oral contraceptives solely to restore menses or improve bone density because they can mask recovery while energy deficiency continues. Bone and cardiovascular health require attention, and severe bradycardia, hypotension, orthostasis or electrolyte disturbance may need inpatient care.
For chronic anovulation such as PCOS, address metabolic and reproductive goals and provide endometrial protection with an appropriate progestogen-containing strategy when spontaneous bleeding is infrequent. Hormonal contraception may regulate bleeding and treat hyperandrogenic symptoms when medically eligible, but it is not a fertility treatment. Ovulation induction belongs in a fertility plan after diagnosis and appropriate assessment.
Premature ovarian insufficiency needs specialist confirmation, cause evaluation, fertility counselling, psychological support and hormone therapy in most patients until the usual age of menopause unless contraindicated. Intermittent ovarian function and spontaneous conception can occur; hormone replacement is not contraception. Hyperprolactinaemia, thyroid disease and other endocrine causes are treated according to aetiology. Uterine adhesions or congenital anomalies require experienced gynaecological management. Every plan should address contraception or conception goals, bone health, mental well-being and a review point.
Prescribing Information
This is a prescribing-safety framework, not a drug chart. Do not prescribe hormones simply because menstruation is absent. First exclude pregnancy, identify whether the person is hypo-oestrogenic or chronically anovulatory, clarify uterine anatomy, review migraine, thromboembolism, blood pressure, liver disease, cancer history, interacting medicines, fertility goals and the cause being treated. Verify current Indian product information and specialist plans.
A short progestogen course may be used diagnostically or therapeutically in selected anovulatory patients, but withdrawal bleeding only shows that responsive endometrium and adequate prior oestrogen exposure may be present. No bleed can reflect hypo-oestrogenism or outflow/endometrial pathology; false interpretations occur. Repeated unsupervised courses can delay diagnosis and should not substitute for an axis-based work-up.
Combined hormonal contraception can protect the endometrium and provide contraception in suitable chronic anovulation, but screen for migraine with aura, smoking and age, hypertension, venous thromboembolism, cardiovascular and liver disease, breast cancer and interactions. It should not be used solely to improve bone density in functional hypothalamic amenorrhoea. Correct the energy deficit instead.
Hormone therapy for POI is replacement of prematurely lost ovarian hormones, not ordinary contraception. The 2024 international guideline recommends treatment until the usual menopause age for prevention as well as symptoms when not contraindicated. A uterus requires adequate progestogen with systemic oestrogen. Route and formulation are individualised. Dopamine agonists, thyroid treatment, ovulation induction and gender- or puberty-related hormone regimens require cause-specific expertise. Document indication, expected benefit, pregnancy implications, adverse effects, monitoring and what requires urgent review.
When to Refer
Refer urgently for a positive pregnancy test with pain, bleeding, syncope or haemodynamic symptoms; severe bradycardia, hypotension, orthostasis or electrolyte disturbance in suspected energy deficiency; severe headache with visual or focal neurological symptoms; acute pelvic pain with an obstructive mass; rapid virilisation; adrenal crisis features; or serious systemic illness. These require emergency or same-day pathways rather than routine endocrine testing.
Primary amenorrhoea meeting evaluation thresholds generally warrants coordinated gynaecology or paediatric-adolescent gynaecology assessment, particularly with absent secondary sexual development, cyclic pain, a mass, absent uterus, atypical genital anatomy or possible genetic condition. Care should be sensitive, staged and explicit about uncertainty; examination, imaging and genetic testing require informed consent.
Refer secondary amenorrhoea when initial testing suggests POI, persistent hyperprolactinaemia, pituitary disease, severe hyperandrogenism, an androgen-secreting tumour, intrauterine adhesions, complex PCOS, fertility need or diagnostic uncertainty. POI needs specialist reproductive, bone, cardiovascular and psychological planning. Suspected genital tuberculosis or Sheehan syndrome requires appropriate gynaecology, endocrinology or infectious-disease expertise.
Functional hypothalamic amenorrhoea benefits from multidisciplinary support when eating disorder, low bone density, fracture, mental-health risk or inability to restore energy balance is present. Fertility treatment should follow recovery efforts and a complete work-up.
A useful referral includes menarche and cycle chronology, pregnancy results, secondary sexual characteristics, weight trajectory and vital signs, examination and ultrasound, FSH, LH, estradiol, TSH and prolactin, targeted androgen results, medicines, procedures, red flags, fertility goals and the patient's understanding and preferences.
Red Flags
Pregnancy is the first safety issue in secondary amenorrhoea. A positive or possible pregnancy with unilateral pelvic pain, shoulder-tip pain, bleeding, dizziness, syncope or shock requires urgent assessment for ectopic pregnancy or haemorrhage. Severe abdominal pain, vomiting, guarding or a pelvic mass can indicate torsion or obstruction even when no pregnancy is present.
Neurological warning features include severe or persistent headache, visual-field change, diplopia, focal signs, persistent non-self-induced vomiting, unexplained thirst or polyuria, and laboratory evidence of multiple pituitary-hormone deficiencies. Galactorrhoea alone is not an emergency, but it supports prolactin evaluation. Rapidly progressive hirsutism, deepening voice, clitoromegaly, increased muscle mass or other virilisation requires urgent exclusion of an androgen-secreting tumour.
Energy-deficiency red flags are severe bradycardia, hypotension, orthostasis, hypothermia, electrolyte disturbance, syncope, cardiac symptoms, very low intake, purging, acute weight loss, fracture, suicidality or other eating-disorder risk. Normal body mass index does not exclude medical instability.
Primary amenorrhoea with monthly severe pain, urinary retention or a pelvic mass can indicate obstructed menstrual outflow. Amenorrhoea after major postpartum haemorrhage with lactation failure, weakness or hypotension suggests hypopituitarism. Fever, pelvic pain, discharge, infertility risk or constitutional symptoms may require infection evaluation, including genital tuberculosis only when context supports it.
Postmenopausal bleeding is not amenorrhoea and needs its own pathway. Safety-netting should specify which symptoms require immediate care and should never imply that a negative home pregnancy test excludes every early pregnancy.
Indian Clinical Context
The National Medical Commission curriculum explicitly requires learners to discuss primary and secondary amenorrhoea, their investigation and principles of management. No current Indian statutory national amenorrhoea treatment guideline was identified for this draft. Diagnostic and management detail therefore comes from ASRM, the Endocrine Society and the international POI guideline, with their non-Indian jurisdictions stated. Local clinicians must adapt tests, medicine choice and referral to Indian regulation, laboratory quality and service access.
Pregnancy tests, TSH, prolactin and gonadotrophins are widely recognisable components of assessment, but ultrasound, pituitary MRI, genetic testing, DXA, fertility services and paediatric gynaecology may be variably available. A staged plan should distinguish essential early questions from specialist tests. Limited access is not a reason to prescribe repeated hormones without pregnancy exclusion or to ignore delayed puberty, neurological symptoms, severe energy deficiency or an outflow obstruction.
India-specific history may include postpartum haemorrhage and lactation failure suggesting Sheehan syndrome, previous uterine curettage or infection suggesting adhesions, and genital tuberculosis risk in a selected patient with infertility or uterine scarring. These are contextual possibilities, not assumptions based on geography. Avoid indiscriminate tuberculosis testing or empirical treatment without an appropriate diagnostic pathway.
Confidential adolescent care, consent, family involvement chosen by the patient, menstrual stigma, nutrition, sports pressure, fertility expectations and cost all affect evaluation. Use non-stigmatising language and do not imply that amenorrhoea proves infertility. Teleconsultation can gather history and review results but cannot replace examination for instability, virilisation, abnormal anatomy or a mass. Generic prescribing and explicit follow-up are safer than unsupported brand or supplement claims.
NMC Competency Mapping
Amenorrhoea maps directly to NMC CBME Curriculum 2024 competency OG25.1, which requires the learner to describe and discuss causes of primary and secondary amenorrhoea, their investigation and principles of management. The competency supports an axis-based answer rather than memorising isolated syndromes. It also integrates physiology of puberty and the menstrual cycle, endocrinology, genetics, anatomy, pharmacology, radiology and communication.
At the Know level, learners should define primary and secondary amenorrhoea, state the evaluation thresholds, describe the hypothalamic-pituitary-ovarian-uterine-outflow axis and list physiological, endocrine, ovarian and anatomical causes. Pregnancy must appear first in secondary amenorrhoea.
At Know How level, learners should use breast development, uterine anatomy, hyperandrogenism, galactorrhoea, FSH and estradiol patterns to localise the problem. They should select pregnancy testing, TSH, prolactin, gonadotrophins and pelvic ultrasound as appropriate first steps, then justify targeted androgen, genetic, pituitary or bone testing. They should recognise that a progestin-withdrawal response is not independently diagnostic.
At Show How level, the learner can take a confidential menstrual, nutritional, exercise, pregnancy and endocrine history; assess secondary sexual characteristics respectfully; explain examination and imaging; recognise red flags; and present a cause-directed management and referral plan under supervision.
No extra condition-specific code is invented. Formal assessment should use OG25.1 and the institution's current ledger. Safe competence includes communicating uncertainty, fertility implications and follow-up without telling a patient that absent periods automatically mean permanent infertility.
Key Exam Pearls for NEET PG
Primary amenorrhoea is evaluated when there is no menarche by 15 with normal secondary sexual development, no menstruation within five years of early breast development, or no breast development by 13. Secondary amenorrhoea means more than three months without menses after regular cycles or six months after irregular cycles. Pregnancy may need exclusion after a much shorter delay and is the first test when possible.
Think in compartments: hypothalamus, pituitary, ovary, uterus and outflow tract. Initial tests commonly include hCG, TSH, prolactin, FSH and estradiol, with pelvic ultrasound. Absent breasts suggest inadequate oestrogen exposure. Breasts present but uterus absent raises Müllerian agenesis or complete androgen insensitivity; testosterone and karyotype are specialist-directed. Cyclic pain with no outflow suggests obstruction.
Low or normal gonadotrophins with low estradiol suggests hypothalamic or pituitary disease; high FSH with low estradiol suggests ovarian insufficiency. Hyperandrogenism suggests PCOS or adrenal disease, while rapid virilisation requires tumour exclusion. A normal or polycystic-appearing ovary alone does not diagnose PCOS. Persistent prolactin elevation requires medication and pituitary evaluation.
Functional hypothalamic amenorrhoea is a diagnosis of exclusion. Restore energy balance; do not use a combined pill solely to regain menses or improve bone density. POI before 40 affects bone, cardiovascular, reproductive and psychological health; hormone therapy is generally recommended until the usual menopause age when not contraindicated, and it is not contraception. Post-curettage amenorrhoea suggests intrauterine adhesions; postpartum haemorrhage with lactation failure suggests Sheehan syndrome.
Frequently Asked Questions
What is the first test when a person develops secondary amenorrhoea?
Exclude pregnancy first whenever conception is possible, even if contraception was used or a home urine test was negative very early. Serum hCG can be preferable when the consequence of a false-negative urine test is important. Once pregnancy is excluded, history, examination, TSH, prolactin, FSH, estradiol and pelvic ultrasound usually direct the next steps rather than a universal exhaustive hormone panel.
When should primary amenorrhoea be investigated rather than observed?
Evaluation is indicated by age 15 when secondary sexual development is otherwise normal, within five years of breast development if that began before age 10, or when breast development has not started by age 13. Severe cyclic pain, a pelvic mass, unusual genital anatomy or systemic symptoms justify earlier assessment. The evaluation should be age-appropriate, consent-based and sensitive to privacy.
Can stress or exercise be diagnosed as the cause without further tests?
No. Functional hypothalamic amenorrhoea is a diagnosis of exclusion. Clinicians should assess pregnancy, anatomy, thyroid and prolactin disorders, ovarian insufficiency, PCOS, medicines and systemic illness while taking a detailed nutrition, exercise, weight, stress and fracture history. Severe bradycardia, low blood pressure, orthostasis, electrolyte disturbance or eating-disorder risk may require urgent multidisciplinary or inpatient care.
Does amenorrhoea mean that pregnancy is impossible in the future?
No. Fertility depends on the cause, and ovulation can occur unpredictably in several conditions, including functional hypothalamic recovery and premature ovarian insufficiency. Amenorrhoea is not reliable contraception. Some causes respond to treatment; others need fertility counselling or assisted reproduction. Avoid promising either permanent infertility or certain natural conception before the diagnosis, ovarian function, anatomy and individual goals are assessed.
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