A gastric tube is inserted through the nose throat and then into the stomach. Gastric intubation may have side effects such as damage to mucous membranes, decreased appetite and choking. 1. Damage to mucosa: Gastric tube may damage the mucosa of the nasal cavity, esophagus and stomach, causing local pain and discomfort, and in severe cases, chronic ulcers may be formed, resulting in a long period of time without healing of the wound, and even require surgical repair. 2. Decrease appetite: Gastric tube insertion may decrease appetite. Gastric tube insertion usually sends nutrient solution directly to the stomach, which may inhibit gastrointestinal peristalsis and make the stomach’s digestive and absorptive functions decline compared with before. 3. Choking: When gastric tube is inserted, if the patient does not cooperate well, it will be easily inserted into the trachea, causing choking. If the vocal cords are irritated during the insertion of gastric tube, it may also cause hoarseness. It is recommended that the patient should remove the gastric tube in a timely manner after the nutrition has been secured, in order to avoid the harm caused by long-term insertion of gastric tube to the body.