Past exam of the medicine course of the University of Oxford / 1866 / Second examination / Diseases of women and children; principles of surgery / 1 / Solution

Absent menstruation is a sign with several causes; treatment must distinguish physiological absence, failure of menstrual cycling and obstruction of outflow. The word “suppression” does not establish that retained blood is poisoning the body or that producing a bleed will cure the underlying problem.

First distinguish primary amenorrhoea, where menstruation has never begun, from secondary amenorrhoea, where established cycles have stopped. Ask about the previous pattern, possibility of pregnancy, breastfeeding, age, illness, nutrition, exercise, medicines and associated symptoms. Pregnancy, lactation and menopause can explain physiological absence. Pregnancy must be considered before any proposed menstrual stimulant, with assessment for complications when pain or abnormal bleeding accompanies the missed period.^[ref]

A second group has impaired hormonal signalling or ovarian function. Severe illness, inadequate energy intake, major exertion and stress can suppress the hypothalamic–pituitary–ovarian axis. Other possibilities include thyroid disease, hyperprolactinaemia, primary ovarian insufficiency and chronic anovulation. These modern categories separate processes that an 1866 clinician might group under debility, constitutional disease or disordered ovarian activity. Anaemia and wasting deserve investigation and treatment when present, but are not universal explanations for every missed period.

A third group has an anatomical explanation. Cyclical pain with absent visible menstruation can indicate retained menstrual material behind an imperforate hymen or other outflow obstruction. Congenital absence or abnormal development of reproductive organs is different again. Acquired scarring of the uterine cavity may interrupt bleeding after instrumentation or disease. The response to obstruction is diagnosis-specific correction by an appropriate specialist; neither a “tonic” nor a drug intended to provoke uterine contraction repairs an absent or blocked passage.^[ref]

In period terms, treatment of a genuine associated illness, improved nourishment and protection from exhausting conditions could be sensible. Warm baths and drugs called emmenagogues were also employed, but their use should not be mistaken for proof of efficacy, or attempted before excluding pregnancy. Menstrual absence should not automatically be interpreted as the cause of mental or systemic illness.

Modern correction: investigate the relevant physiological pathway and treat its cause. Selected investigations include a pregnancy test, prolactin, thyroid-stimulating hormone, ovarian and pituitary hormone measurements and pelvic ultrasonography. For functional hypothalamic suppression, restore energy availability and address contributing illness or disordered eating; simply imposing withdrawal bleeds can conceal persisting energy deficiency. Hormone replacement may be appropriate for ovarian insufficiency, while thyroid, prolactin-related and anatomical disorders need their own pathways. Management of chronic anovulation includes reproductive goals and protection of the endometrium, rather than just the appearance of regular bleeding.^[ref][ref]