Bleeding after intercourse like menstruation has two etiologies, classified as physiological factors and pathological causes. It is important to go to the hospital to see if it is menstruation or abnormal bleeding, especially to exclude pathological factors causing cervical disease, endometrial disease, miscarriage, etc. Of course, the physiological factors may be the imminent menstruation itself, when intercourse stimulates the contraction of the uterus thus leading to early menstruation. A. Physiological factors If the time of intercourse is close to the menstrual period, you need to consider the possibility of early menstruation. The onset of menstruation is influenced by a variety of factors, and it is normal to be 7 days early or 7 days late. Second, pathological factors 1, miscarriage: if there is no measure of recent sexual activity, and bleeding accompanied by paroxysmal abdominal pain symptoms, need to consider the possibility of miscarriage. At this time should be immediately sent to the doctor, if there are symptoms of incomplete abortion, need to perform surgery, after surgery should be closely monitored changes in the condition, while avoiding sex; 2, cervical disease: such as cervicitis, cervical polyps, cervical cancer, etc., can be manifested as contact bleeding, as vaginal bleeding may cause anemia, weakness, etc., need to gynecological examination, if necessary, colposcopy + cervical biopsy, or scraping clear diagnosis If necessary, colposcopy + cervical biopsy or diagnostic scraping is needed to confirm the diagnosis. 3. Endometrial diseases: such as endometrial cancer, uterine fibroids, etc., all have irregular vaginal bleeding and red vaginal discharge, causing pain, abdominal distension, masses and other symptoms.