Symptoms of precancerous endometrial lesions include bleeding and vaginal discharge. 1. Bleeding: If endometrial precancerous lesion is present, there will be irregular menstruation, abnormal vaginal bleeding and irregular menstruation period. If the menstrual bleeding is prolonged or the bleeding is too heavy, anemia may occur and even lead to shock, so timely scraping and examination should be carried out. 2. Vaginal discharge: some precancerous endometrial lesions may also lead to increased vaginal secretion, which may only be a small amount of brown vaginal discharge, and may be accompanied by pain, but it is rare, and requires good daily attention. To determine whether there is endometrial lesion, especially precancerous lesion, it is necessary to go through professional pathological test to determine, and not only rely on symptoms to judge the condition.