Brown discharge one week after menstruation may be some physiological phenomenon, or it may be a symptom of certain diseases, such as endometritis, uterine polyps, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Physiological factors: Consider physiological bleeding during ovulation, the level of estrogen secreted by ovaries will temporarily decrease after ovulation. Vaginal bleeding (which may be brownish in color) will occur when the level of estrogen decreases severely, so that the endometrium will atrophy, detach, and necrolyze due to the lack of support from estrogen. 2. Pathologic factors: (1) Endometritis: bacteria break through the defense of the cervix to invade the endometrium and inflammation occurs, which is mainly manifested by lower abdominal pain, fever, abnormal vaginal discharge (may be brownish), menstrual abnormalities and so on. (2) Uterine polyps: the main clinical manifestations are abnormal uterine bleeding (which may be brownish in color), such as extra bleeding between menstrual periods, postmenopausal vaginal bleeding, and also abnormal menstruation. There are more causes for this symptom, and other factors cannot be ruled out. Patients are advised to consult a doctor in time, who will clarify the cause and give targeted treatment.