Commonly found in the following aspects:1. Incomplete atrophy of the ovarian corpus luteum, resulting in luteinizing hormone secretion imbalance, incomplete stripping of the uterine lining, and dribbling of menstruation.2. Some women take medications during menstruation for various reasons, such as medications that activate blood circulation and eliminate blood stasis, which have an effect on menstrual periods, resulting in prolonged menstruation, and are even accompanied by an increase in the amount of blood in the menstrual flow.3. Suffer from diseases such as uterine fibroids, endometrial polyps and so on. On the one hand, the abnormal bleeding from the lesion site will lead to prolonged menstrual period; on the other hand, the abnormal lesion tissue will affect the normal contraction function of the uterus, which will prolong the duration of menstruation.4. Diseases other than those of the reproductive system, such as liver diseases affecting the synthesis of blood clotting factors; diseases of the blood system, resulting in insufficient number or poor function of platelets, may cause prolonged menstruation bleeding and increased amount of menstrual blood. increase.