Stomach pain with diarrhea is associated with gastric ulcer, indigestion, acute gastroenteritis, and other factors. In some people, stomach pain is a severe colic, which mainly occurs about 1-2 hours after meals, and the degree of diarrhea is not particularly serious, and this condition is related to gastric ulcer. When the ulcer surface of the gastric mucosa exists, it will stimulate the gastric glands to secrete a large amount of gastric acid, which will cause pain in the stomach due to the violation of the gastric mucosa. Excess stomach acid entering the intestine will stimulate the intestinal peristaltic speed to increase, so it will be accompanied by diarrhea symptoms. Stomach pain is a bloating pain and diarrhea is also more severe and related to indigestion. People with indigestion are not able to empty the food in the stomach in time, so it will produce gas by bad fermentation in the stomach, resulting in stomach distension. When the half-digested food enters the intestine, it can cause irritation to the intestine, resulting in diarrhea due to increased intestinal burden. When stomach pain plus diarrhea is accompanied by nausea, vomiting, abdominal distention, and chills, most of them are caused by an attack of acute gastroenteritis. During an attack of acute gastroenteritis, inflammation exists in the mucous membrane of the digestive system, so spasmodic contractions of the smooth muscles of the digestive system occur, leading to stomach pain and diarrhea manifestations.