The main reason for the pain is the following; first, consider the symptoms of dysmenorrhea, many women have dysmenorrhea, may be primary dysmenorrhea, may also be secondary dysmenorrhea, mainly due to the endometrial local prostaglandin secretion increased, resulting in uterine contraction, resulting in stomach pain, if the primary dysmenorrhea can be The second consideration is gynecological disease, many women have gynecological inflammation, when the inflammatory reaction is more serious, it will lead to pain; third, there may be other malignant tumors or systemic diseases, the best timely medical treatment, when the stomach pain is more serious, it is best to take pain medication in a timely manner.