Brown discharge on the sixth day of menstruation is usually normal, but if it is accompanied by vaginal discharge odor, lower abdominal pain and other manifestations are abnormal phenomena. Normal duration of each menstrual period is generally 2 to 8 days, an average of 4 to 6 days, if there is brown discharge on the sixth day of menstruation may be due to menstruation is not completely over, still in the normal time of menstruation. If there is brown vaginal discharge on the sixth day of menstruation accompanied by odor, lower abdominal pain, or vulvar itching, it may be vaginitis, pelvic inflammatory disease or endometrial inflammation and other abnormalities, it is recommended to promptly consult a gynecological examination, vaginal secretions and gynecological ultrasound, etc., and follow the doctor’s instructions to standardize the treatment after the diagnosis is clear. Therefore, if the sixth day of menstruation only brown discharge is a normal phenomenon, do not need to worry too much, but if there are accompanying symptoms are abnormal phenomena, it is recommended to consult a doctor in a timely manner, so as to avoid delaying the condition.