Heavy period: when to worry

Heavy menstrual bleeding needs medical advice when it disrupts daily life, causes weakness, or comes with urgent warning signs. Bleeding that repeatedly soaks through protection, lasts longer than expected, or produces large clots is worth discussing with a clinician even if you feel otherwise well.

Heavy periods can result from changes in the womb lining, fibroids or polyps, adenomyosis, hormonal changes, thyroid disease, or a bleeding tendency. Some medicines and contraceptive methods can also alter menstrual flow. Bleeding between periods, after sex, or after menopause has different implications and should be assessed rather than assumed to be part of a heavy period.

Ongoing blood loss may lower iron stores and lead to tiredness, shortness of breath on exertion, dizziness, headaches, or a racing heartbeat. The amount can be difficult to judge, so the pattern and effect on your body matter more than one isolated cycle.

Record when bleeding starts and stops, how often you change pads or tampons, whether you pass clots, and any pain or dizziness. Bring the list of medicines, supplements, and contraception you use. Arrange a primary-care appointment for persistent or troublesome bleeding; assessment may include a conversation, examination, blood tests, and sometimes imaging.

Rest, drink fluids, and eat iron-containing foods while arranging care. Do not start iron tablets or change prescribed medicines without advice. Anti-inflammatory medicines may not suit people with stomach, kidney, bleeding, or pregnancy concerns, so check with a pharmacist or clinician first.

Seek urgent medical help if bleeding is very heavy and you feel faint, confused, unusually breathless, or have chest discomfort. Get prompt advice for severe or worsening pelvic pain, possible pregnancy, bleeding after menopause, or bleeding that continues despite rest and usual protection. If you become too weak to stand safely, do not drive yourself.

Ask what could be causing the change, whether you need a blood count or iron testing, and which treatments fit your health history. Ask how your contraception, medicines, thyroid health, pregnancy possibility, or family history might affect the assessment, and when to return if the bleeding continues.