Menstrual Disorders

Menstrual Disorders - A primer on timing flow pain and when patterns deserve attention

Clinical review September 2026

Periods rarely read the textbook with military precision. Variation is normal; suffering in silence is not an entry requirement. “Menstrual disorders” is a useful umbrella for periods that are unusually heavy, frequent, infrequent, painful, unpredictable or disruptive. The important question is not whether a cycle is perfectly behaved, but what it is doing to your life.

Patterns are data, not a nuisance

A simple record of bleeding days, flooding, clots, pain, missed work or school, mood and medicines can make a clinical conversation much sharper. Heavy menstrual bleeding is defined by its impact on quality of life, not by the impossibly impractical task of measuring every millilitre. Bleeding between periods, after sex, or after the menopause should always be checked.

Pain may be primary dysmenorrhoea, caused by uterine prostaglandins, or secondary to conditions such as endometriosis, adenomyosis or fibroids. Heavy bleeding can be linked to fibroids, adenomyosis, polyps, ovulatory dysfunction, thyroid disease, bleeding disorders or medicines. Sometimes no structural cause is found; that still leaves treatments available.

A focused assessment avoids both shrugging and over-testing

Pregnancy testing, a full blood count and a medication review are common starting points. Examination, ultrasound or hysteroscopy are chosen according to symptoms, age and risk factors. NICE recommends considering hysteroscopy when history suggests submucosal fibroids, polyps or endometrial pathology; it is not necessary to scan every uterus simply because it owns a calendar.

Iron deficiency can cause fatigue, breathlessness and poor concentration even before anaemia becomes dramatic. Discuss symptoms and testing when bleeding is heavy, especially if everyday activity is shrinking around your period.

Treatment should match the problem you want solved

For heavy bleeding with no major cavity-distorting pathology, a levonorgestrel-releasing intrauterine system is often an effective first option. Tranexamic acid and anti-inflammatory medicines can reduce bleeding or pain for many people; combined hormonal contraception, cyclical progestogens and other options may suit different priorities. Surgery is reserved for selected structural causes or when medication does not fit or has not worked.

If cycles are very infrequent, the question turns towards ovulation and endometrial protection; that overlaps with PCOS and amenorrhoea. If pain is the central issue, endometriosis or adenomyosis may need their own investigation and management plan. The same symptom word—“period”—can hide several entirely different plots.

Urgent reasons to seek help

Get urgent advice for very heavy bleeding with dizziness, fainting, chest pain or shortness of breath; possible pregnancy with pain or bleeding; or severe new pelvic pain. Otherwise, book a routine review if bleeding is changing, heavy, painful or simply taking up too much of life.

Important safety note

This page is for general education and cannot replace individual medical advice. Seek urgent help for severe symptoms, possible pregnancy with pain or bleeding, collapse, confusion, seizure, or any situation in which you feel acutely unwell. A clinician who knows your history can help tailor investigation and treatment.