Normal leukorrhea should be white or transparent, and it has the function of keeping the vaginal mucous membrane moist. What we usually call pink leucorrhea is actually caused by a small amount of blood mixed in the leucorrhea. A small amount of vaginal bleeding mixed in the leucorrhea can appear as pink leucorrhea, or brown leucorrhea, both called bloody leucorrhea. Bloody leucorrhea is seen in a variety of causes: a more common phenomenon, mid-menstrual leucorrhea generally lasts 2-3 days, the menstrual volume is relatively small, mostly considered to be ovulatory bleeding caused by ovulation, mostly normal physiological phenomenon. In addition, oral emergency contraceptive pill, about a week after stopping the pill will have withdrawal bleeding. If there is blood in the leukorrhea after sexual intercourse, it is mostly seen in cervical erosion and cervical polyps; blood in the leukorrhea, accompanied by increased menstrual volume and long periods, consider whether there is uterine fibroids or adenomyosis; long-term blood in the leukorrhea can also be seen in malignant tumors of reproductive organs; women of childbearing age with blood in the leukorrhea need to exclude whether it is a pregnancy miscarriage or ectopic pregnancy; postmenopausal women need to exclude whether it is a malignant tumor. There are many reasons for leukorrhea, divided into physiological and pathological. If you have abnormal vaginal bleeding, you must go to the hospital in time to check the specific cause and then treat it actively.