Analysis of illness: Hello, the cost of painless gastroscopy in 3A hospitals is about 440 yuan, and it is relatively expensive in coastal areas. The second hospital and the third hospital should be lower. Guidance: you should not eat for 4 hours before gastroscopy, and you should not drink water for 2 hours. In addition, if there are patients with upper respiratory tract infection and excessive phlegm, it is not appropriate to do painless gastroscopy for the time being, and you should do it after the upper respiratory tract infection is good. I wish your health.