Gastroscopy, Helicobacter pylori test, serum anti-mural cell antibody and other tests are needed to see gastric diseases, which can help to detect and diagnose gastric diseases, but there is no clinical guarantee that the presence of gastric lesions can be detected after the examination. 1. Gastroscopy: Gastroscopy is the most commonly used and accurate method for detecting esophageal, gastric and duodenal diseases, which can not only visualize mucosal lesions, but also take biopsies for histological pathology. 2. Helicobacter pylori test: It is commonly used in clinic to check whether there is infection by carbon 13, carbon 14 breath test or rapid urease test under gastroscope, which plays an important role in the diagnosis and treatment of pre-cancerous diseases and lesions of the stomach, gastric ulcer, gastrointestinal mucosa-associated lymphoma and other diseases. 3. Measurement of serum anti-mural cell antibody, endogenous factor antibody and vitamin B12 level is helpful in the diagnosis of autoimmune gastritis. At present, clinical examination is of great significance for the detection and diagnosis of the disease, but there are still some limitations, if you have gastric symptoms, it is recommended to consult a doctor in time and follow up regularly.