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Menstruation - Definition


Definition


Menstruation is the scientific name for periods, monthly blood loss through the genital tract in women in relation to the menstrual cycle. They start at puberty, around 11-13 years old, then return cyclically on average every 28 days. They generally last 3 to 5 days, and come from the destruction of the inner lining of the uterus, called the endometrium or uterine lining, by a decrease in the level of ovarian hormones in the absence of fertilization. Menstruation ceases during pregnancy and breastfeeding due to the hormonal changes they cause. Some birth control pills can also block menstruation. The permanent cessation of menstruation marks the end of reproductive capacity: menopause usually occurs around the age of 50. Abnormal menstruation can exist when periods are too abundant in quantity or duration, this is called menorrhagia, or painful menstruation, called dysmenorrhea.
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