The menstrual phase refers to the period of time in which the inner lining of the uterus (the endometrium) sloughs off and sheds, expelling the blood and endometrial cells through the vagina. The first day of menstruation marks the beginning of the menstrual cycle. Menses (active menstrual bleeding) typically lasts 4–5 days.

For more information, see Menstruation.

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