Below the female usually refers to the vagina, the main causes of bleeding are: 1, normal physiological conditions, ovulation bleeding, menstrual blood. 2, disease factors, pregnancy-related diseases, pre-eclampsia, ectopic pregnancy, gravida, inflammatory diseases of the female reproductive system vaginitis, cervicitis, endometritis, etc., genital tumors uterine fibroids, cervical cancer and endometrial cancer, systemic diseases platelet quantity and quality abnormalities, 3. The use of drugs can cause breakthrough bleeding or withdrawal bleeding after women take estrogen and progesterone drugs, so it is usually necessary to conduct relevant examinations after symptoms appear and combine with the history of previous diseases to make a clear diagnosis.