Running stomach pain right lower abdomen hidden pain is considered to be caused by muscle spasm, but also may be caused by intestinal spasm, chronic enteritis, chronic appendicitis and other factors. 1. Muscle spasm: spontaneous tonic contraction of the muscles in the lower right abdomen during running, resulting in muscle spasm causing pain. 2. Intestinal spasm: Intestinal spasm may occur during running due to improper ventilation during exercise, cold and other factors, resulting in pain in the lower right abdomen. 3. Chronic enteritis: especially when the inflammatory lesions are located in the right lower abdomen, the symptoms of hidden pain in the right lower abdomen may occur, which may also be accompanied by diarrhea and other symptoms. 4. Chronic appendicitis: patients can have mild to moderate pain in the right lower abdomen during running, and the pain site is limited. Running stomach pain in the lower right abdominal pain, if the pain is severe or frequent episodes are recommended to go to the hospital, ask the doctor to make a judgment, clarify the cause of the disease, and give the treatment plan.