Painless gastroscopy technique. Dream gastroscope is also called painless gastroscope or comfortable gastroscope. On the basis of traditional gastroscopy, patients are put to sleep by using narcotic drugs to reduce discomfort and pain during examination. During the dream gastroscopy, the doctor will first inject the patient with anesthetic to put him to sleep. Then, the doctor inserts the soft gastroscope into the patient's stomach through the mouth for examination and treatment. During the whole process, patients will not feel pain or discomfort, and there will be no adverse reactions such as nausea and vomiting.