Bleeding after intercourse may be caused by gynecological diseases such as cervical polyps, pre-cancerous lesions of the cervix and cervical cancer, vaginitis, etc., or acute injuries, prepuce glans, urethritis and other factors. 1. Gynecological diseases: for example, cervical polyps, pre-cancerous lesions of the cervix and cervical cancer, vaginitis, etc., which can lead to localized congestion of the cervix or vagina, increased vascular fragility, and during sex, it will lead to bleeding after intercourse. 2. Acute injury: greater force during intercourse may lead to localized damage to the reproductive organs, and bleeding will occur after intercourse, which may be accompanied by pain, swelling and other symptoms. 3. circumcision: when there is circumcision, the glans localized congestion and edema, in the process of sexual life on the local stimulation, it will lead to bleeding after intercourse, accompanied by glans pain, itching and other symptoms. 4. Urethritis: due to the urethral mucosa congestion and edema, excessive pressure and stimulation during sex, it is easy to bleed after intercourse, accompanied by urinary frequency, urinary pain and other symptoms. Bleeding after intercourse indicates the existence of abnormalities, and it is recommended to seek medical examination and treatment as soon as possible.