Before menstruation, the leukorrhea is brown, considering that the leukorrhea contains a small amount of blood formation, the reason may be related to the following factors: 1, the luteal function is insufficient or premature degeneration leads to the secretion of progesterone is affected, the hormone level is low can’t maintain the stability of the endometrium during the secretion period, a small amount of endometrium will be shedding, shedding of endometrium and a small amount of bleeding in the uterus storage time is relatively long, the discharge of the uterus can be made. If the leukorrhea is brown in color, it can be treated without treatment if it occurs occasionally, just pay attention to observation. If the symptoms appear continuously, you need to do hormone adjustment, you can supplement hormones appropriately to improve the luteal function. 2, may be related to gynecological diseases, if there are cervical polyps, cervicitis, vaginitis may also appear. 3, if the body is cold or overworked will also appear before menstruation brown discharge, pay attention to rest and keep warm.