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What is a period?

A period (also called menstruation) is part of a woman's normal menstrual cycle. An average menstrual cycle is 28 days, although it can vary from 21 to 35 days. During a period, the uterus sheds its lining (which contains cells, blood and mucous) and this passes out through the vagina.

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Author: Kellie Heywood
First answered: 23 Nov 2014
Last reviewed: 19 May 2018
Rating: 4.5 out of 5
Votes: 1117 (Click smiley face below to rate)
Category: Premenstual syndrome (PMS)


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