Stomach distension after eating is considered to be caused by indigestion, acute and chronic gastritis, gastric ulcer, duodenal ulcer, chronic hepatitis and other diseases of the upper gastrointestinal tract. If patients with indigestion exist in the presence of overeating, due to insufficient gastric power and slow gastrointestinal peristalsis, the stomach cannot digest food in time when food is ingested, and the long stay in the stomach causes delayed gastric emptying, and food stimulates the stomach wall causing abdominal distension and abdominal pain. Patients with acute and chronic gastritis, due to the presence of inflammation in the mucosa of the stomach, there will be congestion, edema, decreased digestive function food can not be digested in a timely manner, food in the stomach on the stomach wall constantly cause stimulation, causing stomach distension and pain. Patients with gastric ulcer, because the protective layer of gastric mucosa has been damaged gastric acid secretion more, has appeared ulcer surface, when eaten food will stimulate the secretion of more gastric acid, on the gastric mucosa will further erosion, which leads to stomach distension and pain. Patients with duodenal ulcer can also suffer from stomach pain due to excessive secretion of stomach acid and stimulation of the mucous membrane. Patients with chronic hepatitis have a lack of bile secretion due to impaired liver function, and when they eat fatty foods, they cannot help the small intestine digest fatty substances resulting in abdominal distension and abdominal pain.