If the basal layer of the endometrium is injured, women will experience a decrease in menstrual flow, which is manifested by a short period of menstruation, which may be cleared in 1-2 days, and the color of menstruation is very dark, dark red, and the amount of menstruation is not very large. This is due to the shedding of the endometrium during menstruation. The endometrium is divided into the basal layer and the functional layer, and when menstruation occurs, the functional layer of the endometrium is shed. If the basal layer is damaged, it cannot be regenerated and repaired after menstruation, so the functional layer of the endometrium does not grow, resulting in a small amount of menstruation. Therefore, women should pay attention to minimize the number of operations on the uterus.