Diarrhea with stomach pain may be caused by intestinal spasm or acute and chronic enteritis, as follows: First, diarrhea caused by intestinal spasm, the contraction of the smooth muscle of the intestinal wall will cause intestinal spasm, mostly manifested as acute paroxysmal pain, often accompanied by diarrhea, bloating, acid reflux, belching, nausea, vomiting and other symptoms, the symptoms of abdominal pain can be reduced after bowel movements and exhaustion. Intestinal cramps are mostly caused by improper diet, such as overeating, cold diet, eating too much food with irritation, toxic infection of parasites, and bad psychological factors can also induce intestinal cramps. Second, acute and chronic enteritis, diarrhea is the main symptom of enteritis, enteritis is the acute and chronic inflammation of the intestinal mucosa, the intestine can be congested, edema, increased water, so it will cause the symptoms of diarrhea, the intestinal mucosa is stimulated, so it will produce a painful sensation. If there is bacterial or viral infection, it can also cause neuropathic pain.