The most important stomach disease to be alert for is gastric cancer. Other diseases include gastric lymphoma, gastric polyps, benign gastric ulcers, fundic varices, gastric constant diameter aneurysms, gastritis, and gastric emptying dysfunction. Various diseases can affect the life health and quality of life of patients to different degrees. Therefore, early diagnosis and early intervention is an important part of the cure. How can a wide variety of gastric diseases be diagnosed as early as possible? Stomach diseases can be classified into four different categories: tumor, vascular, functional, and infectious. Neoplastic: including gastric cancer, gastric polyps, gastric ulcer, gastric lymphoma, etc. The gold standard for diagnosis is gastroscopy + biopsy. Other diagnostic methods include barium meal angiography, gastric enhancement CT, gastric ultrasound endoscopy, and tumor marker examination for gastric adenocarcinoma; vascular: including venous fundic varices, which can be confirmed by enhancement CT, and arterial constant diameter aneurysms, which can be diagnosed by DSA angiography or ultrasound endoscopy; functional: including gastric emptying dysfunction, gastric bile reflux, etc., which can be diagnosed by Infectious: gastric infections are mainly H. pylori, which can be diagnosed by C-14 breath test. Other infections are very rare, except in extreme conditions such as low immunity.