An Su nutrient solution. According to the doctor's network, the indications for clinical use of nasal feeding are mainly diseases of stomach, duodenum, biliary tract or pancreas. For example, after the resection of gastric cancer and the recovery period of acute severe pancreatitis, patients can't eat by mouth, but their small intestine and colon function are normal. Usually, the feeding tube is inserted into the jejunum through the nasal cavity, and then nutrient solution is infused to ensure the daily calorie demand of patients, thus reducing the infusion of intravenous nutrition.