Bleeding after intercourse is mainly caused by cervical diseases, and the following points need to be noted: 1. cervicitis, which is often erosive and can be easily damaged and bleeding by the friction of male genitalia during intercourse; 2. cervical polyps, which are fragile and bleed when touched and are bright red in color; 3. cervical cancer, which is the earliest symptom of bleeding after intercourse, as the capillaries at the cancer are concentrated and can be easily damaged and ruptured and bleed. If the cancer develops further, it is more likely to bleed; 4, endometriosis, if the ectopic lining grows in the cervix, it may touch the ectopic lesion during intercourse and cause bleeding and abdominal pain at the same time; 5, pelvic inflammatory disease, pelvic inflammatory disease can cause pelvic congestion, if the endometrium is seriously congested, it may also bleed during intercourse; 6, excessive force during intercourse may cause posterior fornix laceration, and bleeding is more serious It will need surgical treatment.