Menstruation is the time of month when a woman's womb (uterus) sheds its lining, causing bleeding through the vagina. Menstruation periods usually last about 3 to 5 days, but every woman is different. Follow the links below to find WebMD's comprehensive coverage about menstruation, how it occurs, when you should see a doctor, and much more.
Pain, bleeding, and missed periods may be signs that something is wrong.
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