The last day of menstrual blood is brown for several reasons: First, it is considered to be a normal situation, under normal circumstances, menstrual blood is dark red, in the last day of menstruation, the amount of blood inside the uterus is basically less, if not discharged in time, through the oxidation of the brown color will result in the appearance of brown, is a relatively normal. Secondly, we can not completely exclude other problems, such as gynecological inflammation, women who have vaginitis, pelvic inflammatory disease, etc., will also lead to menstrual blood can not be discharged normally, after a long period of time after the color will change. Third, it may also be endocrine disorders, dietary factors or uterine cold, usually do not pay attention to health care, there is a cold uterus will affect the normal color of menstrual blood, usually do a good job of abdominal warmth, do not often eat cold food.