The main reasons for the appearance of brown discharge before menstruation are as follows: First, it may be due to the fact that the endometrium is less exfoliated when menstruation first comes, and the brown discharge is not excreted in time in the uterine cavity and stays for a longer period of time. Second, when women have ovarian luteal insufficiency, the corpus luteum atrophies early, due to the lack of progesterone secretion leads to early menstruation, may be manifested as a brown discharge before the onset of menstruation. Once in a while, women can take oral granules of motherwort or capsule of blood to promote blood circulation in the pelvis and observe temporarily.