Vaginal bleeding is brown. In addition to bleeding caused by a small amount of endometrial shedding around menstruation, it is mainly considered to be related to ovulatory bleeding, pre-eclampsia, poor postpartum uterine regeneration and cervicitis. Patients are recommended to receive timely treatment and pay attention to rest.1. Ovulatory bleeding: After ovulation, the estrogen in the patient’s body temporarily decreases and a small amount of endometrium is shed, which in turn leads to bleeding. If the blood is not discharged in time, it may oxidize and turn brown. Generally, the symptom can gradually disappear in 2-3 days, just pay attention to rest. 2. Pre-eclampsia: In case of pregnant women, it may be pre-eclampsia, due to the detachment of the embryo from the uterine wall, resulting in endometrial blood vessels breaking off and bleeding. If the blood is not discharged in time, the hemoglobin in the blood may change to dark brown by oxidation, at this time the patient should follow the doctor’s prescription for fetus preservation treatment; 3, poor postpartum uterine regeneration: if there is a retained placenta, the uterus contraction is weak, making the uterus regenerate poorly, which in turn leads to vaginal bleeding symptoms, if the blood is not discharged from the vagina in time, the color becomes dark. Patients can take new biochemical pellets to accelerate the discharge of residual tissues and promote uterine repair. 4. Cervicitis: It is mainly caused by pathogens infecting the cervix, usually Chlamydia trachomatis and Neisseria gonorrhoeae, which can manifest as abnormal vaginal bleeding, accompanied by vulvar itching and burning sensation. After oxidation of hemoglobin, the color becomes dark brown, and surgical treatment is the main treatment, supplemented by medication. 6.