Menstruation that has not been clean and an endometrial thickness of 1.3 centimeters could be anovulatory abnormal uterine bleeding or endometrial pathology, among other things. The main reason why women have menstruation is the bleeding caused by the shedding of the uterine lining, so during menstruation the uterine lining is relatively thin. Now the menstruation is always not clean and the endometrium is 1.3 cm, which is not normal, it may be anovulatory abnormal uterine bleeding, or endometrial lesions, etc. 1. Anovulatory abnormal uterine bleeding. You can choose medication to regulate it under the guidance of your doctor. You can take drugs such as dextroprogesterone or progesterone to promote the shedding of the uterine lining. You can also use high potency progesterone to promote endometrial atrophy and achieve the purpose of stopping bleeding, such as taking norethindrone, and scraping the uterus when necessary, which also has the effect of stopping bleeding. 2. Endometrial lesions. If menstruation is not clean all the time and the endometrium is thick, we should also consider whether there is endometrial pathology, and suggest diagnostic scraping for pathologic examination. If endometrial cancer is identified, surgery is needed.