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What is a menstrual period? Vaginal bleeding that occurs in adolescent girls and
women as a result of hormonal changes. It usually happens in a predictable pattern, once a month, and is a sign you a...
American Congress of Obstetricians and Gynecologists
409 12th Street SW, Washington, DC 20024-2188 | Mailing Address: PO Box 70620, Washington, DC 20024-9998