Women appear to come to menstruation but feel that the blood down the situation, there are several specific reasons: 1, if the period found still to come, it is recommended to check laboratory tests to exclude the possibility of pregnancy; 2, recently had an abortion, scraping or uterine cavity operations, thus appearing to menstruation period feel menstruation is coming, but the blood down the situation, mainly because of cervical adhesions or cervical adhesions caused. After cervical adhesions, blood cannot flow out and the patient may show abdominal pain, bloating or anal cramping, and a small amount of dark-colored blood may flow from a small number of women. In the case of cervical adhesions, most of the blood will not flow out, resulting in abdominal pain or menstrual blood reflux, usually ultrasound can find blood in the uterine cavity, or a small amount of blood in the pelvic cavity; 3. Mental stimulation or drinking cold water or beer during menstruation can cause menstrual blood to accumulate inside the uterus, and some patients even have dysmenorrhea, at this time it is recommended to take herbs to activate blood circulation and remove stasis, or apply warm water bags on the abdomen; 4. The vaginal atresia, which leads to menstruation, and is accompanied by small abdominal pain, can be cured by surgical treatment.