Since the timing of vaginal bleeding after sex and the amount of bleeding varies among women, its exact cause will vary from person to person. If a woman has more vaginal bleeding after intercourse, and it is like having a period, and there is also the manifestation of menstruation, and this is immediately after the menstrual period, it is often considered to be menstrual flow, just due to the coincidence of intercourse? It’s not. If a woman has vaginal bleeding after sex, and the bleeding time is between 3 and 5 days, but the amount of bleeding is relatively small, and there is pain in the lower back and other uncomfortable performance, it is often considered to be ovulation bleeding caused by a small amount of endothelial shedding due to the fluctuation of estrogen during ovulation. If a woman has simple vaginal bleeding after intercourse, and the color of the bleeding is bright red, the amount is relatively small, and there is no other abnormal discomfort, then it should be considered as contact bleeding caused by local problems of the cervix, most often caused by cervical erosion, or even cervical intraepithelial neoplasia, or cervical cancer and polyps. If the contact bleeding is caused by a local cervical problem, it is often necessary to go to the gynecological department of the hospital for an internal examination to confirm the cause of the bleeding, and then to carry out symptomatic treatment.