why does menstruation occur
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The menstrual cycle occurs due to the rise and fall of hormones. This cycle results in the thickening of the lining of the uterus, and the growth of an egg, (which is required for pregnancy). ... If pregnancy does not occur, the lining is released in what is known asmenstruation.
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When the egg is not fertilized, it lives for about one day. Since the uterus prepares itself every month to release an egg, it also prepares itself to receive a fertilized egg. The uterine wall breaks and blood is released from the vagina. Usually this period lasts 2-8 days and is termed as menstruation. The blood released contains waste materials, mucus, etc.
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