Gastroscopy is a mandatory test for definitive diagnosis and treatment in many cases. Especially for early stage upper gastrointestinal tumors, there are no specific symptoms and the symptoms may not be different from gastritis and gastric ulcer, however, their treatment methods are completely different. Only after gastroscopy, the diagnosis can be clarified and the treatment plan can be determined. Most people will feel nauseous and vomit during the gastroscopy, but most of them can persist through it. In addition, for patients who really can’t stand it, painless gastroscopy can be done.