Angelica sinensis belongs to traditional Chinese medicine, which has the functions of enriching blood, regulating menstruation and relieving pain. It can be used for treating various symptoms of blood deficiency, such as irregular menstruation, amenorrhea, dysmenorrhea, abdominal mass, etc. Angelica sinensis acts on female uterus, which will cause functional changes of uterus and lead to micro-bleeding, which is a normal phenomenon.