Gastroscopy reveals thickening of the stomach wall does not confirm cancer. Gastric wall thickening can be caused by inflammatory lesions in the stomach such as acute gastritis, chronic hypertrophic gastritis, or tumor lesions such as invasive gastric cancer, gastric lymphoma, gastric smooth muscle tumor, etc. Therefore, only observing gastric wall thickening can not be sure of having gastric cancer. Patients who are suspected of having gastric cancer can make a comprehensive judgment through the measurement of tumor markers, pathological examination and other examinations, as well as the combination of symptoms related to gastric cancer such as anemia, emaciation and abdominal pain, etc. Gastroscopy alone cannot confirm the diagnosis of gastric cancer if the thickening of gastric wall is detected. Patients with gastroscopic examination of gastric wall thickening are recommended to go to hospital and ask doctors to make judgment, rather than making blind judgment on their own.