Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue (known as menses) from the inner lining of the uterus through the vagina . The first period usually begins between 12 and 15 years of age, a point in time known as menarche. Most women have between 11 and 13 menstrual periods each year . Bleeding usually lasts around 5 days , but this too can vary...
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