The most common causes of stomach pain after eating are the following three: 1. chronic gastritis, including chronic superficial gastritis and chronic atrophic gastritis, which manifests itself as hidden pain under the subxiphoid process after eating, often accompanied by abdominal distension and belching, and patients are advised to improve gastroscopy. 2. peptic ulcer, generally referred to as gastric ulcer, patients feel pain under the subxiphoid process after eating, often accompanied by heartburn and acid reflux, and in severe cases will 3. chronic cholecystitis and gallbladder stones, which are characterized by pain in the right upper abdomen or subxiphoid process after eating, often aggravated by abdominal pain after eating fatty foods, often accompanied by abdominal distension, nausea, and even belching, suggest patients to improve ultrasound examination of the gallbladder.