How do periods work?


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Shanna Graves answered
Once a woman's body has matured to the point where she is able to carry a baby, the uterus starts building up a lining that can cushion and nourish a baby. If the woman does not get pregnant within 28 to 32 days, the lining is no longer needed, so it is shed from the body. The process of the shedding of the lining is a period (menstruation).

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