The next day after menstruation, vaginal bleeding, mainly consider three situations: First, menstruation, women menstruation within a week although there is no vaginal bleeding, but there may still be a small amount of blood in the uterine cavity, there will also be a small amount of blood in the leukorrhea, but purely look at the color of the leukorrhea can not be observed. When patients do routine examination of leukorrhea or urine test, it can be detected that there is occult blood, mainly because when menstruation is about to end, the stripped endometrium is very small, and the amount of blood is also very small, so the blood in the uterine cavity can be partially absorbed, and does not come out, but after the patient has intercourse, under the mechanical collision, it may lead to uterine contraction enhancement, and promote the discharge of blood. In this case, the amount of bleeding is very small, and it can be cleaned up in 1-2 days, so it does not need to be treated. Second, the main consideration is contact bleeding, coitus contact bleeding should first consider the cervical lesions caused by, so must do gynecological examination, and cervical cancer screening. Thirdly, we should consider other causes of bleeding, mainly consider gynecological inflammatory diseases, endometrial polyps, cervical polyps, adenomyosis, fibroids or cervical cancer, endometrial cancer and other cancerous diseases. Gynecological examination, gynecological ultrasound, hysteroscopy or tumor markers and other related tests must be done for differential diagnosis.