Menstruation just gone for five days and then come back is divided into physiological causes (ovulation bleeding) and pathological causes, such as uterine fibroids, endometrial hyperplasia and so on. Physiological causes mainly refer to ovulation bleeding, women in the ovulation period, the body estrogen level suddenly dropped, while the level of progesterone did not rise, at this time there may be a small number of endometrial irregular shedding, causing a small amount of vaginal bleeding. Pathological causes are mainly endometrial hyperplasia, endometrial polyps, uterine fibroids and other organic diseases caused by irregular vaginal bleeding, which need to be clarified by ultrasound and hysteroscopy under the guidance of doctors. It is recommended that women with the above conditions should go to the hospital in time for standardized diagnosis and treatment under the doctor’s guidance to avoid delaying their condition.