The patient’s vaginal discharge appears as brownish leukorrhea with no obvious odor and no obvious discomfort. There are the following reasons: 1, if it occurs before the onset of menstruation, it is a manifestation of the imminent onset of menstruation, which occurs mainly due to a small amount of bleeding caused by the stripping of the uterine lining.2, if the brown leukorrhea occurs in the middle of the two menstrual cycles, it is due to the change of estrogen levels in the body during ovulation, caused by a small amount of bleeding.3, after placing the sterilization ring in the uterine cavity of some women, a small amount of bleeding occurs in the endometrium, and there may also be a brown leukorrhea without obvious odor and without obvious discomfort symptoms. A small amount of bleeding phenomenon, there may be no obvious odor, no obvious discomfort symptoms of brown leukorrhea. 4, preparation for pregnancy during the female, about 10 days after intercourse, not accompanied by odor and itchy symptoms of brown leukorrhea, more than considered to be the manifestation of implantation of the bleeding, the reason for this symptom with estrogen levels a transient decline.