Gastroscopy can be done if the indications for gastroscopy are met and there are no contraindications for newly detected diabetes. Indications for gastroscopy include the presence of unexplained upper gastrointestinal bleeding, upper gastrointestinal symptoms such as upper abdominal discomfort, bloating, pain, esophageal cancer, gastric cancer, high-risk groups, people who need to receive gastroscopic treatment or follow-up review, upper gastrointestinal barium meal contrast examination can not determine the lesion or the symptoms do not correspond to the results of the examination. Contraindications are mainly severe lung diseases such as asthma, respiratory failure, etc. who can not lie down; severe heart disease, such as myocardial infarction in the active stage, severe heart failure; severe hypertension, mental illness, and obvious impairment of consciousness who can not cooperate; the presence of acute perforation of the upper gastrointestinal tract; acute stage of corrosive esophageal injuries; the presence of acute severe pharyngeal disease leading to difficulties in inserting the gastroscope, and so on. Therefore, diabetes mellitus is not a contraindication to gastroscopy, so those who have the above indications can choose gastroscopy after consulting a specialized doctor.