Whether endometrial shedding is good or bad depends on the situation: 1. Menstruation refers to the shedding and bleeding of the endometrium that accompanies the cyclical changes of the ovaries. Normal women shed their endometrium every month and have menstrual flow, which is a normal physiological phenomenon, so endometrial shedding is a good thing. If the endometrium does not shed and bleed, this condition may be a menstrual disorder.2. If the patient has fertility requirements and there is endometrial shedding and menstrual flow, it may be a bad thing, indicating that pregnancy is not conceived again this month.