Is it normal to pass large blood clots during menstruation?

Answers from Mary M. Gallenberg, M.D.

Passing blood clots during menstruation can be normal. The amount, length and frequency of menstrual bleeding vary from woman to woman.

However, passing large blood clots may be a sign that something's not right. If your periods seem heavier than usual — for instance, soaking through one pad or tampon every hour for several hours, passing large blood clots, or passing many smaller blood clots in a short time — check with your doctor.

Your doctor can determine if there's an underlying problem causing your heavy periods. Your doctor may also recommend a blood test to check for anemia, a blood condition that can cause you to feel weak or tired.

Mar. 01, 2013