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Bleeding between periods

Normal menstrual flow lasts about 5 days and produces a total blood loss of 60 to 250 mL and occurs every 28 days. There are several causes of abnormal vaginal bleeding and a careful exam by a health care provider is frequently the best way to sort out the source of the bleeding.

Review Date: 4/1/2023
Reviewed By: John D. Jacobson, MD, Professor Emeritus, Department of Obstetrics and Gynecology, Loma Linda University School of Medicine, Loma Linda, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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