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Menstruation, or period, is normal vaginal bleeding that occurs as part of a woman's monthly cycle. Every month, your body prepares for pregnancy. If no pregnancy occurs, the uterus, or womb, sheds its lining. The menstrual blood is partly blood and partly tissue from inside the uterus.
Menstruation is a natural process which usually starts at the age of 12 years in women. Menarche is the first time a woman bleeds. It occurs due to excessive production of estrogen. Menstruation is a physiological process which occurs during the fertile period of a women. It is an indication that the women is now fertile and can conceive. Menstruation generally occurs in a cycle of 28 to 34 days. The period or duration of bleeding varies from one woman to another.