Gastrinoma gastroscopy shows ulcers and strictures in the esophagus, multiple and ectopic ulcers in the stomach and duodenum. Gastrinoma is an endocrine tumor derived from pancreatic D cells or duodenal G cells. It causes severe peptic ulcers and hyperacidity due to overproduction of gastrin. This is why multiple, large ulcers are often found on gastroscopy, but the location is usually atypical. Gastroscopy also reveals esophageal ulcers and erosions, as well as the formation of esophageal strictures, due to the reflux of high stomach acid into the esophageal area. If the diagnosis of gastrinoma is confirmed, it is recommended to go to the hospital to improve the relevant examination, and follow the doctor’s instructions to carry out standardized treatment as early as possible in order to reduce the adverse effects of the disease.