Nasogastric tube is a type of insertion of gastric tube, while gastric tube includes both transoral gastric tube and nasogastric tube. Typically, a nasogastric tube is about 105 centimeters in length and is inserted about 55 centimeters through the patient’s nostrils, through the nasopharynx, esophagus and then to the stomach. An orogastric tube is inserted directly through the mouth for about 30 to 40 centimeters, through the pharynx, esophagus and then to the stomach. Gastrostomy tubes are mainly used in patients who are unable to swallow on their own, such as those who are unconscious, have difficulty swallowing, or have undergone surgery on the larynx or esophagus. Nutrients and medications can be supplied directly through the tube, and the tube can be withdrawn to find out what is going on in the stomach. Nasal feeding tubes are often used for patients who have the ability to chew to prevent the patient from biting the tube. Transoral gastric tube is often used for critically ill patients who cannot insert gastric tube through the nose. However, if the tube is inserted for a long period of time, it may cause damage to the mucous membrane at the contact site. Therefore, the patient should actively cooperate with the doctor for treatment, and the tube should be removed as soon as possible to resume normal feeding.