Why does polycystic ovary syndrome cause heavy periods?

Heavy Periods is a common presentation of Polycystic Ovary Syndrome. PCOS may interrupt regular ovulation. Without predictable ovulation, the usual balance between oestrogen and progesterone can change, and the womb lining may continue to thicken. When bleeding begins, more lining may be released over a longer or less predictable episode.

Some people with PCOS have infrequent periods rather than heavy bleeding, while others notice both irregular timing and a heavy flow. Heavy menstrual bleeding can also come from fibroids, polyps, thyroid problems, pregnancy-related causes or bleeding disorders, so it should not automatically be attributed to PCOS.

Track bleeding days, cycle gaps, clots, pain and symptoms such as tiredness or breathlessness. Arrange a clinical review if periods are heavy, prolonged, difficult to predict or affecting daily life. A clinician may assess for anaemia, pregnancy and other causes, then discuss options to regulate bleeding or protect the womb lining.

Use the treatment plan provided and mention migraine, clotting history, liver disease, medicines and pregnancy plans because these details affect which options are suitable.

Get urgent medical help for bleeding that rapidly soaks pads, faintness, severe weakness, breathlessness, chest pain, severe pelvic pain or a possible pregnancy with pain or bleeding. Prompt assessment is also needed when heavy bleeding leaves you unable to carry out normal activities.

Ask what may be causing the bleeding, whether you need a blood count or pregnancy test, how to protect the womb lining, and which treatments fit your health and pregnancy plans.