Bleeding during sex may be due to physiological or pathological reasons, physiological reasons are commonly found in first time sex, etc. Pathological reasons can be found in chronic cervicitis and cervical cancer, etc. 1. First time sex: hymen consists of connective tissue and neurovascular, first time sex will lead to hymen rupture, which will lead to bleeding during sex. 2. Chronic cervicitis: due to the long-term stimulation of inflammatory factors, the cervix will be congested and eroded, and the stimulation of the cervix by the penis during sex will lead to bleeding, which is often accompanied by painful intercourse. 3. Cervical cancer: polyps or cauliflower-like cervical organisms are common in the cervix, often accompanied by infections, brittle and easy to bleed, which can be manifested as bleeding during sexual life and painful sexual intercourse. If bleeding occurs during sexual intercourse, it is necessary to consult a doctor in time after excluding physiological reasons, and further treatment or therapy will be provided under the guidance of the doctor after clarifying the causes.