The main consideration for the etiology of vaginal discharge of brown stuff is whether there is gynecological inflammation, such as vaginitis, cervicitis, endometrial inflammation, which may affect the brown discharge. There is a situation where pregnancy leads to preeclampsia, and some early pregnancy conception and implantation may have brown discharge, because the bleeding is small and the color is easy to be brown or coffee color. Some people ovulation will also have this situation, the menstrual cycle regular case about 14 days before menstruation is ovulation, ovulation by the body of estrogen, progesterone secretion, there will be ovulation bleeding, bleeding is small, some are brown or coffee color. It is best to need to do ultrasound to see the uterus, ovaries, gynecological examination to see the vagina, cervix, need to draw blood tests and pregnancy-related HCG, comprehensive analysis to assess exactly which cause.