In the pre-menstrual period appeared stomach pain, there is obvious falling sensation, this falling sensation of stomach pain has seriously affected the daily life, in the clinic is mainly due to the following reasons: 1, chronic inflammation of the pelvis. As the pelvis begins to be in a state of congestion before menstruation, the pelvis itself is already in a state of congestion due to inflammation, which aggravates the congestion of the original inflammation, so there will be stomach pain with a falling sensation; 2, because of endometriosis caused by endometriosis, endometriosis is characterized by the fact that the foci of endometriosis will appear to bleed when menstruation occurs. Before menstruation, the foci of endometriosis will appear to be congested, so it will also cause stomach pain and a falling sensation in the lower abdomen; 3. In the clinic, if it is a mild abdominal pain accompanied by a falling sensation, which does not affect the daily life in the clinic, it is most likely to be caused by the pelvic congestion, and there is no need to intervene in the clinic for this situation.