If a woman has a very thick endometrium that causes her periods to be persistent or to bleed for a particularly long period of time, consider abnormal hyperplasia of the endometrium, called functional uterine bleeding, which can lead to prolonged periods and increased menstrual flow, and can easily lead to bleeding and infection. The best treatment is to perform diagnostic curettage, which is the more common type of curettage followed by the use of hormonal methods to stop the bleeding. If there are endometrial lesions, choriocarcinoma, etc. which can also cause thickening of the endometrium and lead to irregular periods, the final diagnostic treatment, which requires diagnostic curettage, is performed. If a woman’s menstruation lasts more than 7 days and the menstrual flow is particularly heavy, she should pay attention to it and come to the hospital for examination in time.