Menstruation is self-limiting and is controlled by hormone levels in the body. A normal period should end within 2-8 days, with an average of 3-5 days. In clinical practice, whether menstruation is completely clean can be judged by symptoms. 1. Observe vaginal bleeding: no leukorrhea with blood within 3 days after menstruation, or occasional vaginal bleeding; 2. Observe vaginal discharge: no bloody or coffee-colored discharge from the vagina, white or yellowish vaginal discharge, no blood smell, no abdominal pain and other uncomfortable symptoms; 3. Internal gynecological examination: no blood at the cervical opening. Second, the causes of prolonged menstruation 1, the pathology of the uterus: ultrasound except endometrial hyperplasia, endometrial polyps, submucosal fibroids, depending on the situation may take different surgical treatment; 2, dysfunctional uterine bleeding: can take estrogen, progesterone and other drugs to stop bleeding or adjust the menstrual cycle; 3, systemic diseases: active treatment of the original disease; 4, the placement of intrauterine devices: drug therapy In case of ineffectiveness, removal of the IUD can be considered. Precautions during the period of unclean menstruation 1.