The main reasons for bleeding during intercourse in women are as follows: 1. Bleeding caused by cervical or vaginal lesions is the most common cause, such as benign diseases like vaginitis and cervicitis, or malignant neoplastic diseases like cervical cancer and vaginal cancer. When patients have intercourse bleeding, cervical screening and vaginal discharge examination must be done to clarify the related etiology.2. Bleeding caused by vaginal or cervical injury due to too rough intercourse, patients mostly have pain and discomfort at the pubic or vulva, and gynecological examination can see the injury site with local inflammation.3. If intercourse bleeding is occasional before or just after menstruation, it is considered to be 4, occasional coital bleeding, but also consider that it may have nothing to do with coitus, may be ovulatory bleeding or other reasons bleeding, happens to occur after coitus, need to be related to the situation for examination and treatment.