Gastric pain is a gastric ulcer, duodenal ulcer, etc. During the disease, gastric ulcer is accompanied by pain in the stomach due to the presence of ulcers on the gastric mucosa, especially when there is hunger, the concentration of gastric acid in the stomach is relatively high, so the pain of patients will be more obvious. When patients with gastric ulcers have pain, proper intake of food can dilute the concentration of gastric acid and prevent the gastric acid from invading the gastric mucosa, so the pain can be reduced. Some people’s stomach pain is caused by duodenal ulcer, which can be characterized by hunger pain and midnight pain. This is mainly due to the fact that when hungry, stomach acid enters the duodenum in high concentration, causing irritation to the duodenal mucosa. Patients with duodenal ulcers can neutralize the stomach acid by eating appropriate food when pain occurs. When the concentration of stomach acid decreases, the irritation caused to the duodenal mucosa will be reduced, and the pain will be alleviated as a result.