There are physiological and pathological causes of coital bleeding 4 months after delivery, physiological causes generally do not require treatment, pathological causes require timely consultation, may require examination and surgical treatment. 1. Physiological reasons and treatment: after the birth of coitus when the action is intense, this situation, in addition to bleeding, but also easily accompanied by vaginal local redness, swelling, pain and other discomforts, it is recommended that the action of some gentle, generally can be avoided. Another reason is menstruation. Vaginal bleeding may occur when menstruation resumes four months after delivery, and it is recommended to pay attention to good hygiene and care. 2. Pathological causes and treatment: the body has not completely recovered from childbirth, the incision is not healing well, etc., can also lead to coital bleeding 4 months after childbirth, this situation needs to go to the local hospital obstetrics and gynecology department in a timely manner to review, to understand the incision and the body’s recovery, and to formulate a treatment plan. Cervical lesions can also lead to bleeding during intercourse 4 months after delivery, which is usually painless contact bleeding and requires cervical TCT and HPV examination. The first thing you need to do is to find out the exact cause of the bleeding, so you can go to the gynecology department of your local hospital for a checkup and a clear diagnosis.