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The shedding of the uterine lining as part of the menstrual cycle. This often appears as a bloody liquid, but sometimes is more solid, and is made of numerous components, of which blood is only one.

Usually, a depo-provera injection, a long-term progestin-only hormonal from of birth control.

The flow during menstruation, composed mostly of endometrium, including blood. Sometimes flow contains portions of the endometrium as solid tissue, which is often confused with blood clots.