Gastric tube insertion is difficult in comatose patients without voluntary consciousness. Under normal circumstances, the gastric tube is inserted through the nasal cavity, and the patient is required to make swallowing movements when passing through the throat to cooperate with the physician in order for the front end of the tube to enter the esophagus and stomach smoothly. If the comatose patient is unable to cooperate, it is necessary for the doctor to improve the obstruction in the throat by manipulation. The gastric tube is inserted through the nostril to about 15 cm, and when it reaches the throat the examiner holds the patient’s head up with the left hand so that the patient’s jaw is as close to the chest as possible, and the right hand slowly feeds the gastric tube into the nasal cavity. If the patient has no obvious choking, no respiratory effort, and the tube is inserted to the predetermined length, it should have entered the stomach by this time. You can determine if the tube is actually in the stomach by pumping air into the stomach with a syringe and placing a stethoscope in the stomach to listen for bubble sounds, or by placing the end of the tube in water to see if bubbles are coming out.