Gastropathy of Drugs is an adverse reaction of the stomach caused by drugs, accounting for about 1/3 of drug side effects. many oral drugs can cause gastric discomfort, but sometimes non-oral administration can also cause nausea, vomiting, loss of appetite and other gastric discomfort. The clinical manifestations of drug-related gastroparesis vary depending on the type of drug used, the dose and whether it is combined with stimulant gastric drugs, but mainly the stomach is irritated and the gastric mucosal barrier suffers different degrees of damage resulting in gastric symptoms, and in severe cases, gastric ulcers and bleeding. Gastric ultrasonography: The biggest advantage of gastric ultrasonography is that the sound beam can penetrate the stomach wall, which can show the hierarchical structure of the stomach wall. As a non-invasive diagnostic method, it can provide clinical information on the location, size and morphology of cancer in the stomach wall, and sometimes can estimate the extent of lesion invasion into the stomach wall. It can also detect early gastric cancer, especially to understand the metastasis of perigastric organs, make up for the shortcomings of gastroscopy and X-ray, and provide a basis for clinical selection of treatment plan. At present, the detection rate of transabdominal ultrasonography for gastric cancer is low, and the sensitivity for early gastric cancer is only 15%, so it is not used as a screening tool for gastric cancer. With the clinical application of ultrasound endoscopy, the clinical value of gastric ultrasound has been further improved. Fiberoptic gastroscopy: It has the features of soft body, easy to operate, less painful for patients, safer, wide indications, and no blind area. Fiberoptic gastroscope is a gastroscope made of light-guided glass fiber bundle, which is inserted from the mouth through the esophagus into the stomach. It is used for confirmation, review, biopsy and treatment of various lesions in the stomach and certain esophageal diseases, such as esophagitis, ulcers, tumors, varices, etc., such as foreign body clamping in the stomach, electrocoagulation to stop bleeding, polypectomy and introduction of laser treatment of pancreatic and esophageal malignant tumors. Electronic gastroscopy: High-definition images can be obtained, and various kinds of image processing can be performed by computer, three-dimensional imaging, determination of mucosal blood flow, mucosal local hematocrit content and local temperature, etc. In addition to the three main parts: endoscope, TV information system center and TV monitor, the electronic endoscope is also equipped with some auxiliary devices, such as video recorder, camera, suction device and keyboard used to input various information and various disposal apparatus used for diagnosis and treatment.