The symptom of stomach pain during menstruation is a sign of dysmenorrhea, a symptom experienced by many women. The causes of dysmenorrhea symptoms may be: i. Primary dysmenorrhea symptoms with no obvious cause; ii. Eating too cold food before menstruation, or using cold water to wash the face or feet, etc., which causes abdominal pain symptoms due to cold stimulation leading to uterine contraction and obstruction of blood stasis in the uterine cavity; iii. Endometriosis, which is one of the most important causes of dysmenorrhea symptoms, and the patient exhibits Progressive aggravation of dysmenorrhea; four, uterine fibroids, can also cause patients to experience abdominal pain during menstruation; five, uterine adhesions, cervical adhesions, etc., because of the menstrual blood discharge is not smooth and cause dysmenorrhea symptoms.