Pain on both sides of the stomach may be caused by the following reasons: First, the most common is some diseases of the gastrointestinal tract, such as acute or chronic enteritis, some tumors of the intestine, or intestinal spasm, gastrointestinal dysfunction, intestinal obstruction, etc., there may be pain on both sides of the stomach. Secondly, if it is a woman, there may be some gynecological problems, such as acute or chronic pelvic inflammatory disease, which is usually painful mainly in the lower abdomen, and there may also be dysmenorrhea or endometriosis, which can cause pain in the lower abdomen. Third, it can be some diseases of the urinary tract, such as urinary tract infection or ureteral stones. If it is a urinary tract infection, pain usually occurs in both lower abdomen and the middle bladder, and it is accompanied by frequent, urgent and painful urination. In the case of bilateral stones in the middle and lower ureter, bilateral abdominal pain may also occur. This condition is very painful if it strikes, and is mainly colic, usually accompanied by pallor, vomiting, and other symptoms, as well as percussion pain in the bilateral kidney area.