Heavy flow after a missed period: what to know

A late or absent period may reflect stress, changing hormones, illness, a change in weight, or an irregular ovulation pattern. When bleeding begins, it may feel heavier or last longer than your usual period. Perimenopause and polycystic ovary syndrome can both disrupt ovulation and lead to unpredictable bleeding, but the bleeding pattern alone cannot identify the cause.

If pregnancy is possible, take a pregnancy test and tell a clinician about the missed period and bleeding. Heavy bleeding with one-sided pelvic pain, shoulder-tip pain, faintness, or marked weakness needs urgent assessment because bleeding in pregnancy can require prompt care.

Record when the bleeding started, how often you change pads or tampons, whether clots are present, and any pain or dizziness. Use pads if you need to judge the amount more easily. Arrange a medical review if this is a new pattern, keeps returning, or is affecting daily activities. A clinician may ask about medicines, contraception, pregnancy possibility, cycle history, and symptoms such as acne or excess facial hair.

Seek urgent care if bleeding is rapidly soaking through protection, you feel faint or short of breath, have severe or worsening pelvic pain, or could be pregnant. Contact a clinician soon for repeated heavy episodes, bleeding between periods, bleeding after sex, or tiredness that may point to iron deficiency.

Ask whether you need a pregnancy test, blood count, iron assessment, or an ultrasound. You can also ask how your cycle history changes the possible causes and which treatments are suitable if you are trying to conceive or avoid pregnancy.