Women not in the menstrual period but a small amount of vaginal brown discharge, indicating that there are abnormal vaginal bleeding, the causes need to be based on the history of menstruation, as well as the history of sexual life and triggering factors to determine the synthesis of the specific as follows: 1, if a woman does not have sex, just suddenly appear brown discharge, and just in the ovulation period, more than the consideration of ovulation bleeding caused by the occasional one can not be used to deal with the special treatment; 2, if the If a small amount of brown discharge after intercourse, also consider the cervical lesions, such as cervical polyps, cervical intraepithelial neoplasia and simple cervical erosion; 3, if a small amount of brown discharge after taking emergency contraceptive pills, consider the side effects caused by emergency contraceptive pills.