Unclean menstruation is often caused by the following reasons: 1) lack of estrogen caused by endocrine disorders, so the endometrium is not repaired as soon as possible, resulting in unclean menstruation. 2) inflammation of the endometrium, due to the endometrium has inflammation, the tissue will be relatively brittle, so there will be a shedding of the situation leading to unclean menstruation. 3) due to the endometrium itself caused by disease, such as pre-cancerous endometrium or endometrial cancer, can lead to the situation of menstrual dribbling. 4) the endometrium itself can cause a lot of problems. Pre-cancerous endometrial lesions or endometrial cancer can lead to irregular menstruation. In addition, if there are submucosal fibroids, it will affect the contraction of uterus, so it will prolong the menstrual period and lead to irregular menstruation, which is manifested as increased menstrual flow and shortened menstrual cycle. It is recommended to do sex hormone six, blood routine, ultrasound examination, and give diagnostic scraping surgery if necessary.