Brown leukorrhea suggests a small amount of bleeding and does not necessarily indicate that menstruation is imminent. Women’s endometrium is controlled by estrogen and progesterone to shed periodically to form regular menstruation, when women’s hormone levels are disturbed, it will cause irregular bleeding, due to the less mixed in the leukorrhea manifested as brown leukorrhea. At the end of menstruation, that is, the follicular development period, luteal atrophy incomplete will lead to irregular shedding of the endometrium to form a small amount of blood, is not about to appear menstruation. In the middle of menstruation, that is, during ovulation, the endometrium loses hormonal support due to the simultaneous decrease in estrogen and progesterone levels, and hormonal withdrawal bleeding occurs, which is not related to menstruation. In the luteal phase after ovulation, luteal dysfunction or premature atrophy, insufficient progesterone levels can also cause irregular bleeding, oral contraceptives, blood-activating drugs may cause a small amount of bleeding.