Often patients ask whether they need to do gastroscopy, do it, most people are superficial gastritis, do not do it, patients always feel uneasy in their hearts, therefore, doctors are sometimes difficult to make a decision, so the doctor’s judgment criteria to everyone, the following cases are certain to do gastroscopy, the other cases are up to the patient to decide it. 1, where the doctor suspects that there are esophageal, gastric and duodenal diseases, and the symptoms do not improve or even worsen after active treatment. 2.Esophageal ulcer and gastric ulcer should be given follow-up gastroscopy after standard treatment to ensure complete healing of the ulcer. 3.Patients who are suspected to have gastrointestinal tumors according to clinical manifestations. 4.Patients with gastrointestinal bleeding (vomiting blood, black stool). 5.Patients with unexplained wasting (persistent weight loss) and loss of appetite. 6.Patients with family history of gastric cancer who have gastric discomfort and poor therapeutic effect with long course of disease. 7.Post-operative review of gastric cancer. 8.Other cases considered by the doctor to be in need of gastroscopy.