Vaginal bleeding is bleeding from the vagina during or after sex. Usually the bleeding is not very heavy and only very rarely can cause heavy bleeding. Vaginal bleeding during sex is a common symptom of gynecological disorders and is mainly caused by: 1. Heavy cervical erosion. Patients with severe cervical erosion combined with inflammation sometimes have contact bleeding during lovemaking. 2. Cervical polyps. Cervical polyps can occur as a result of long-term stimulation of the cervix by chronic inflammation. The single or multiple small buds with tips grow at the mouth of the cervix and bleed when touched, so there can be bleeding after making love. 3, cervical cancer. The earliest symptom of cervical cancer is bleeding after making love. Since there are more small blood vessels and more fragile tissues at the cancer lesion, the capillaries will bleed due to damage rupture after making love. 4.Cause of IUD. Because the ring is a foreign body in the uterine cavity, its mechanical pressure can lead to local damage, necrosis and ulceration of the endometrium, and the stimulation of lovemaking will certainly cause bleeding. However, after a period of time, the bleeding will be relieved or disappear when the body gets used to the ring. If vaginal bleeding occurs during sex, you must go to the hospital for examination and use the right medication.