The main reasons for not having a clean period for more than ten days include gynecological inflammation, uterine diverticulum, anovulatory abnormal uterine bleeding and so on. 1. Gynecological inflammation: gynecological inflammation, including vulvitis, vaginitis, cervicitis, pelvic inflammatory disease may cause menstrual disorders, prolonged menstrual period and other symptoms, so there is a menstrual period for more than ten days is not clean. 2. Diverticulum of the uterus: After cesarean section, the uterine incision heals poorly, forming a small depression and diverticulum at the uterine incision. When menstruation ends, the menstrual blood inside the diverticulum is gradually discharged, resulting in blood for more than ten days, half a month, or even the entire menstrual period. 3. Anovulatory Abnormal Uterine Bleeding: Stress, malnutrition, chronic diseases, excessive exercise, alcoholism, etc. can cause dysfunctional regulation of the hypothalamic-pituitary-ovarian axis or abnormal target organ effects leading to dysfunctional menstruation, resulting in dribbling menstruation. There may also be other causes, such as preeclampsia, ectopic pregnancy, coagulation dysfunction, etc. It is recommended that the patient consult a doctor in time and be treated according to the doctor’s diagnosis.