Very heavy periods during perimenopause: what to know

During the menopause transition, ovulation can become less predictable. The lining of the uterus may then build up for longer before it sheds, leading to bleeding that is heavier, longer, or more irregular than your previous pattern. A heavy period is a common presentation of perimenopause, and it can occur alongside missed or irregular periods, hot flushes, night sweats, mood changes, or reduced sexual desire.

Perimenopause is not the only possible explanation. Fibroids, polyps, adenomyosis, thyroid problems, pregnancy-related causes, bleeding conditions, and some medicines can also affect menstrual flow. A clinician may ask about your cycle, examine you, and arrange blood tests or pelvic imaging when appropriate. Heavy blood loss can contribute to iron deficiency, which may cause tiredness, breathlessness, headaches, or paleness.

Keep a simple record of when bleeding starts and stops, how often you change pads or tampons, whether you pass clots, and whether bleeding interrupts sleep, work, or normal activities. Note pelvic pain, dizziness, fatigue, medicines, and any chance of pregnancy. This helps a clinician distinguish a change in pattern from a single unusually heavy cycle.

Arrange a routine appointment if heavy bleeding is new, recurring, or affecting daily life. Ask whether you need an evaluation for anaemia or another cause, and discuss options that fit your health history, contraception needs, and plans for pregnancy. Do not start iron or hormonal treatment without checking what is suitable for you.

Seek urgent medical help if bleeding is soaking through protection repeatedly, if you feel faint or unusually weak, or if you have shortness of breath, chest discomfort, a racing heartbeat, or severe pelvic pain. Seek prompt care for bleeding during pregnancy or after menopause. If you are dizzy, do not drive yourself; ask someone to help or contact local emergency services.

You could ask: Could this bleeding be related to perimenopause or another condition? Do I need a blood count, iron testing, pregnancy test, thyroid check, or pelvic scan? Which treatments could reduce bleeding, and what side effects or health conditions should we consider? What changes should make me contact you sooner?