Some women experience brown vaginal discharge for a few days after menstruation, which may be caused by physiological or pathological factors. The exact duration needs to be determined by the individual’s physical condition. This is a normal physiological phenomenon, because the small amount of menstrual blood in the uterine cavity is not cleared, because it stays in the uterine cavity for a long time, it reacts and turns brown, and is mixed with leucorrhea and is excreted together. 2. Some women have continuous brown discharge after menstruation, probably because of endocrine disorders. The reason for this is the endocrine disorder that causes a small amount of endometrial shedding, which may be a symptom of endometritis.