The appearance of brown blood and not like menstruation in the clinical will often encounter, clinical according to the appearance of time, there are mainly the following situations: 1, if the menstruation just clean appear a little, may be the period is not completely clean; 2, about 1 week after the clean menstruation and brown discharge, the amount is also very small, lasting 2-3 days, known as intermenstrual bleeding, ovulatory bleeding. Because women are estrogen-based before ovulation, after ovulation, the estrogen level drops leading to endothelial reaction, there will be a small amount of bleeding, which is also a physiological phenomenon; 3. A small amount of bleeding in the premenstrual period may be luteal insufficiency. According to the time of appearance of bloody discharge and accompanying symptoms, the doctor will determine whether it is physiological or pathological.