Every night stomach pain, but not during the day, mainly consider the following causes: 1, duodenal ulcer: often characterized by nocturnal pain and hunger pain, due to excessive secretion of gastric acid at night, a large amount of gastric acid stimulates the ulcer wall and induces stomach pain. 2, gastrointestinal lesions and infections: such as chronic gastritis, stomach tumors, gastric ulcer, and also Helicobacter pylori infection, can also appear rhythmless stomach pain, pain at night is obvious, daytime alleviation. 3, gastrointestinal neurosis: patients with frequent insomnia and gastrointestinal neurosis at night due to prolonged sleep disorder may also show symptoms of functional stomach pain. 4, other diseases: pancreatic and gallbladder diseases are not excluded, which are misdiagnosed as stomach pain because of imprecise localization, and it is recommended to go to the hospital immediately for relevant examinations to clarify the cause.