1. Fasting for at least 8-12 hours and drinking for 3 hours before anesthesia. (It is a little more demanding than painless examination. Colonoscopy requires drinking purgative drugs to cleanse and cleanse the intestines to ensure safety and effective treatment.) 2. Patients undergoing painless endoscopy also need to be screened for infectious diseases (hepatitis B virus, hepatitis C virus, AIDS, syphilis) before the examination, and also need to know your blood clotting status (routine blood count, coagulation 4 items, blood sugar) and electrolytes and chest X-ray and electrocardiogram. To prevent bleeding during and after treatment, discontinue aspirin, poliovirus, heparin, favalin, etc. for at least one week. If you cannot stop the medication, you need to communicate with your doctor to find the best plan and time for surgery. 3.For the safety of the patient, the patient and/or family should communicate with the anesthesiologist in person before the anesthesia, so that the anesthesiologist will try to fully understand the patient’s medical history and then have the right to decide whether to implement anesthesia according to the patient’s physical status. 4.The preoperative surgeon will communicate with you and the main family members to inform them of the surgical approach, possible problems, advantages and disadvantages, the most likely problems and complications during and after surgery, which are very important, so please listen patiently, and if you and your family have any questions please communicate directly with the surgeon to avoid disputes. 5.If the patient conceals the condition (such as heart disease, lung disorders, medication history, etc.) and the actual situation, the consequences are serious and may endanger the patient’s life and affect resuscitation. 6, the patient’s anesthesia and examination → wake up → fully awake → back to the ward, the whole process takes about 1 hour, (treatment requires hospitalization, for your safety, you know) according to the degree of difficulty of endoscopic treatment, the time will be significantly different,) in the whole process, please cooperate with the anesthesiologist’s arrangements, to prevent accidental falls and other unexpected events. 7. Routinely fast for 24 hours after surgery to avoid late bleeding and perforation. In case of bleeding and perforation, endoscopic repair and hemostasis can be performed due to clean gastrointestinal tract to avoid surgical intervention, which may cause confusion to you. 8. For early cancer, review the gastrointestinal microscopy six months after surgery. Review gastroscopy 1-2 years after multiple polyp removal surgery. Esophageal vein ligation is reviewed 4 weeks after surgery, and endoscopic ligation can be performed again if necessary. 9.When the patient is under anesthesia → treatment → wake up, family members please wait in the waiting area, anesthesiologists and nurses will take good care of them, please rest assured. The doctor will contact you at your convenience to explain the treatment process and treatment results. 10.Patients will not be in pain because they have almost no memory of the treatment process, so please rest assured. If you suddenly feel pain after waking up, have abdominal distension that cannot be relieved, and always have bowel movements, please inform us immediately and the doctor will deal with it urgently. 11.One day after the completion of the treatment, start to take a small amount of water and observe if there is any discomfort, no discomfort can gradually enter the liquid diet. 12, In addition, it should be noted that some patients may not find all your lesions in the first examination, treatment may find problems not found in the last examination, the doctor will usually treat together, unless special circumstances, the doctor will communicate with your family before dealing with it.