Vaginal bleeding occurs again 3-5 days after menstruation has cleared. In the clinic, it is most common in the following situations: First, bleeding during ovulation. If the patient’s menstrual period is about 7 days, 3-5 days clean just in the ovulation period. Ovulation bleeding, mainly because of the ovulation of estrogen a transient decrease caused by, do not need special treatment, 3-4 days will be clean. Secondly, if it occurs after coitus, it is considered to be contact bleeding. In this case, patients must do gynecological internal examination and cervical cancer screening to exclude cervical cancer lesions. Third, inflammatory diseases of the pelvis. In addition to bleeding, patients have abdominal pain, fever, abdominal drop and other discomforts, which can be clearly diagnosed through gynecological internal examination and leukorrhea test. Fourth, consider gynecological neoplastic diseases. For example, benign neoplastic diseases of endometrial polyps, uterine fibroids, uterine adenomyosis. Malignant tumor diseases such as cervical cancer, endometrial cancer or ovarian cancer.