Aunt generally refers to menstruation, menstruation comes a little and then disappears may be caused by physiological factors such as ovulation bleeding, but also may be polycystic ovary syndrome, uterine adhesions and other diseases. 1. Physiological factors: as the level of estrogen drops during ovulation, the endometrium loses the support of estrogen and may shed, resulting in a small amount of vaginal bleeding, which lasts for a relatively short period of time and can be mistaken for menstruation. 2. Polycystic Ovary Syndrome: Polycystic Ovary Syndrome is a kind of even endocrine metabolic disease, which may be the result of the combined effect of heredity and environment. The high level of androgen in the patient’s body will affect the menstrual level, thus the phenomenon of menstruation coming and going. 3. Uterine cavity adhesion: Uterine cavity adhesion may be caused by endometrial trauma, pathogen infection, decreased estrogen level, heredity and other factors, the patient due to the occlusion of the uterine cavity will affect the outflow of menstrual blood, resulting in the phenomenon of menstruation comes a little and then disappears. After eliminating physiological factors, it is recommended that the patient be admitted to the hospital for examination to find out the specific cause of the menstrual period and then take appropriate treatment.