The best way to check the stomach is gastroscopy, because through gastroscopy can directly visualize the mucosal lesions in the stomach, which is of good diagnostic significance for diagnosing gastritis, gastric ulcer, gastric polyp, gastric cancer, gastric mesenchymal tumors, gastric fundus varices and other diseases. Barium meal of the upper gastrointestinal tract, although barium meal can initially diagnose gastric diseases, it has no practical significance in confirming the diagnosis of the disease. Capsule endoscopy, capsule endoscopy can observe the lesions of the mucosa of the stomach, but it can not carry out pathological diagnosis, for the diagnosis of diseases, especially gastric polyps, gastric mesenchymal tumors, gastric cancer and other diseases, it is necessary to use gastroscopy plus pathology to be able to confirm the diagnosis. Therefore, it is clinically recommended to perform gastroscopy, and if the patient cannot tolerate ordinary gastroscopy, painless gastroscopy can be chosen to improve the symptoms of nausea, vomiting and other discomforts.