Vaginal bleeding that keeps occurring after menstruation and is not clean for more than 9 days is an abnormal phenomenon. It is commonly caused by the following reasons: 1. endocrine disorders caused by estrogen deficiency, the endometrium can not be repaired as soon as possible, so that the menstrual blood has not been clean. 2. due to chronic inflammation of the uterus, resulting in irregular shedding of the endometrium and bleeding. 3. due to submucosal fibroids or large fibroids between the muscle walls of the uterus, resulting in poor contraction of the uterus, the blood sinuses are not able to close, resulting in bleeding after menstruation. 4. The bleeding can be caused by lesions in the endometrium itself, such as overgrowth of the endometrium or atypical hyperplasia of the endometrium, which can cause bleeding all the time after menstruation. Ultrasound examination is recommended. If abnormal thickening of the endometrium is found, diagnostic scraping is recommended and treatment will be given according to the pathological results.