Menstruation refers to the periodic shedding of endometrium accompanied by ovarian ovulation, which is a sign of mature reproductive function. Menstrual blood is generally dark red 70% of the blood comes from vascular bleeding, 5% from cell exudation, and 25% from vein rupture and reflux. In addition to blood, there are endometrial fragments, cervical mucus and exfoliated vaginal epithelial cells. The main feature of menstrual blood is that it does not coagulate, and there are occasional small blood clots under normal circumstances. Normal menstruation is 3-7 days, but the menstrual time of each woman is different, and some patients may only have two days to menstruate.
Advise patients to pay attention to menstrual flow. Normal menstrual flow is 20 to 60 ml. If it exceeds 80 ml, it is called menorrhagia.