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A period is the part of the menstrual cycle when a woman bleeds from her vagina for a few days. For most women this happens every 28 days or so. Women have periods because they have a uterus that sheds its lining every month. (Not all female mammals have menstrual cycles where the uterine lining is shed.). The menstrual cycle occurs because of a complex relationship between hormones from the brain and ovaries. This leads to the development and release of an egg.

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Every month or so, the uterus lining gets thicker to prepare for a fertilized egg if the woman becomes pregnant. If the egg doesn't get fertilized, that lining. There are many reasons why a woman may miss her period, or why periods might stop altogether. Most women have a period every 28 days or so. Why do women have periods? A handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We're one of the select few mammals.

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Women in these areas typically use reusable cloth to absorb menstrual blood, but do not always have facilities or proper cleaning products to adequately. Women have periods because they have a uterus that sheds its lining every month. (Not all female mammals have menstrual cycles where the uterine lining is shed.). Menstruation is a normal and healthy part of life for most women. Roughly half of the female population -- around 26 per cent of the global population[i] -- are.