Gastroscopy technology is used to detect gastrointestinal diseases in the human body, and is a technical means to effectively detect gastrointestinal diseases inside the human body. The gastroscope uses a 1 cm thick hose (with a miniature electronic camera with a cold light source at the end), and the gastroscope penetrates the esophagus, stomach and duodenum from the mouth; the enteroscope enters the rectum, colon and cecum from the anus. The doctor can see through the electronic display screen whether there is a lesion at the examination site, and take out the biopsy cells for laboratory tests and related treatment (such as hemostasis, polypectomy, foreign body removal, etc.). When you choose painless examination, after entering the gastroscopy room, you only need to let the nurse put a needle in your hand, and the anesthesiologist will administer medicine, and then you can sleep beautifully from the beginning of the examination. The advantages of painless gastrointestinal examination are no dead angle, no damage, high diagnosis rate, safety and time saving; patients are not nervous before the examination, no discomfort during the examination, and patients recover quickly after the examination without leaving a “psychological shadow”. If you want to do painless gastroscopy, you need to sign the consent and note that the following conditions are not suitable: 1. history of allergy to anesthetic drugs 2. patients with respiratory tract infection, chronic lung disease 3. overweight 4. severe cardiovascular disease 5. age greater than 85 years 6. women during pregnancy and lactation 7. not fasting before anesthesia 8. acute abdomen, upper gastrointestinal bleeding, intestinal obstruction 9. shock, heart, brain, liver and kidney failure