The normal menstrual period for women is 2-8 days. If the period is not clean for more than eight days after the onset of menstruation, it is a prolonged period. The causes of prolonged periods include the following: 1. Pregnancy: If the past menstruation is very regular, the first time there is a prolonged period, dripping, and women of childbearing age have a normal sex life, the first thing to consider is whether there is a possibility of pregnancy, so to exclude pregnancy caused, it is recommended to do a pregnancy test. 2. Reproductive system tumor: If the period is prolonged and there is no pregnancy, consider a reproductive system tumor, which may 3, improper medication, IUD: improper use of sex hormone drugs, or intrauterine device, that is, after the IUD, can also cause prolonged periods. 4, reproductive system diseases: inflammation of the reproductive system, endometritis, endometrial polyps, or poor wound healing after cesarean delivery resulting in uterine diverticulum, may cause prolonged periods. 5, reproductive system diseases: inflammation of the reproductive system, endometritis, endometrial polyps, or poor wound healing after cesarean delivery resulting in uterine diverticulum, may cause prolonged periods. 5. other diseases: systemic diseases, thyroid diseases, abnormal liver function, or abnormal coagulation function may cause prolonged periods. 6. abnormal uterine bleeding: abnormal reproductive function of the hypothalamic-pituitary-ovarian axis, resulting in anovulatory abnormal uterine bleeding, or abnormal ovulatory uterine bleeding caused by luteal atrophy, may also cause prolonged periods.