Anger during menstruation can cause stomach pain, which may be caused by the following factors: 1. Anger during menstruation can lead to Qi stagnation and blood stasis, and the stagnant blood in the uterine cavity cannot be discharged smoothly, so it can cause abdominal pain. The patient’s menstrual flow will also become less or stop; 2. Anger during menstruation will lead to endocrine disruption, causing the body to increase the level of prostaglandin secretion, which will lead to contraction of the uterus, thus causing abdominal pain symptoms; 3. Anger will also lead to muscle contraction, increased blood pressure, etc., the uterus will also be contracted, which will cause patients to have dysmenorrhea symptoms. During menstruation, women must keep their emotions stable, not to get angry and not to be anxious.