The long duration of menstruation is abnormal, mainly arising from the following reasons: First, consider that it is caused by uterine pathology, the presence of fibroids, uterine polyps, other uterine diseases, which can lead to prolonged menstruation. Second, endocrine disorders can also lead to changes in menstrual time and produce menstrual disorders. Third, other gynecological diseases can also lead to excessive menstruation and prolonged periods, such as pelvic inflammatory disease and endometritis. Fourth, consider functional uterine bleeding, other neoplastic diseases, which can directly affect the function of the uterus and lead to abnormal reactions when they appear. Fifth, consider other external environmental factors, dietary factors, often eating cold, cold, stimulating food.