During sex, improper posture or excessive force may cause damage to the vulva or vaginal mucosa, resulting in bleeding symptoms. If there is only a small amount of bleeding, there is usually no need to be nervous, just keep the area clean and it is recommended to wear loose underwear or outer pants; if there has been active bleeding, it is recommended to go to the hospital for treatment as soon as possible. In addition, if a woman suffers from vaginal inflammation, as the tissue of the reproductive tract is relatively fragile, it may also lead to mucosal breakage and bleeding after sexual friction; if there are cervical lesions, such as cervicitis, pelvic inflammatory disease, cervical epithelial lesions or early stage of cervical cancer, sexual contact bleeding may also occur. In conclusion, there are many causes of bleeding during sex, if necessary, you should actively go to a regular hospital for relevant gynecological examinations, and deal with them in a targeted manner according to the specific causes.