Brown blood in the leukorrhea is mainly due to a small amount of vaginal bleeding, which is oxidized due to the relatively small amount of bleeding and long bleeding time, resulting in a brown-like discharge. The main reasons for this are: a. Cervical erosion, contact bleeding occurs when there is cervical erosion, which causes brown blood in the discharge; b. Endometritis, when there is endometrial inflammation, it causes irregular vaginal bleeding or spotting, which also causes brown blood in the leukorrhea; c. Intermenstrual bleeding, due to changes in the level of estrogen and progesterone in the body, which can lead to ovulation Due to the change of estrogen and progesterone level in the body, a small amount of bleeding can occur during ovulation, which can also cause brown leucorrhea; Fourth, malignant tumors, such as endometrial cancer and cervical cancer, can also cause brown leucorrhea, which requires gynecological examination, vaginal ultrasound, female tumor marker test, HPV, TCT and other tests to make a clear diagnosis.