Bleeding from sex two days before menstruation may be caused by impending menstruation, or by vaginal injury, cervical erosion, uterine fibroids and other causes. 1. Imminent menstruation: If the bleeding is not much, it may be normal bleeding of impending menstruation, which is usually caused by rupture of the uterine lining, and does not need special treatment. 2. Vaginal injury: when sex is too hard, it may lead to vaginal injury, and thus vaginal bleeding occurs. 3. Cervical erosion: Cervical erosion is a physiological change of the cervical columnar epithelium, generally related to the estrogen level in the body, the patient will have contact bleeding, mostly after gynecological examination, sexual intercourse, etc., a small amount of vaginal bleeding, accompanied by lower abdominal pain, leukorrhea abnormalities, increase and other symptoms. 4. Uterine fibroids: uterine fibroids are generally related to sex hormone level, heredity, stem cell mutation and other factors, some patients usually have no symptoms, with the development of the disease, some patients may have abnormal vaginal secretion, when the fibroid ulceration, bleeding, necrosis, the patient’s vagina will appear bloody, pus and blood vaginal fluid, accompanied by a bad smell. If there are symptoms, patients should go to the hospital in time, and after diagnosis, treatment should be carried out under the doctor’s guidance. Patients should go to the hospital regularly for review, and the doctor can adjust the treatment plan according to the review.