Brown discharge 4 days before menstruation may indicate the presence of endocrine hormone abnormalities caused by luteal insufficiency, which may cause brown discharge. Or before the menstruation time for coitus, this time to stimulate the cervix, vaginal wall, this time there may also be brown discharge occurs. It does not affect the health of the body, and it is recommended to observe whether there is such a situation before the next menstrual period. If there is still brown discharge one week before menstruation, it is recommended to take a blood test for progesterone, including estrogen, to fully determine if there is luteal insufficiency. If there is luteal insufficiency, you can take a certain amount of oral menstruation regulating drugs when your period comes, for example, tonic Jiale plus progesterone to regulate the cycle. If there is no such condition, you can observe and follow up for a long time, and a simple occurrence will not affect your health.