A 13-year-old child’s lack of appetite for food may be due to indigestion, chronic gastritis and other diseases, there may also be due to zinc deficiency, and may also be due to anorexia, the causes are different, the treatment is different. 1. Indigestion: Indigestion can lead to symptoms of lack of appetite for food in 13-year-olds. Probiotics such as domperidone and bifidobacteria can be used to improve digestion. 2. Chronic gastritis: chronic gastritis can also lead to 13-year-old children have no appetite for food symptoms, treatment can be used omeprazole, bismuth potassium citrate, clarithromycin, amoxicillin, metronidazole and other drugs for treatment. 3. Zinc deficiency: zinc deficiency can also lead to symptoms of loss of appetite, so it can also lead to 13-year-old children have no appetite for food, treatment can use zinc gluconate and other drugs oral zinc, but also eat more lean meat, animal liver, seafood and other foods to supplement zinc. 4. anorexia: anorexia can also lead to 13-year-old children do not have an appetite for food, treatment should be given to the child’s psychological guidance, and parents need to rationalize the child’s diet to help children complete the nutritional reconstruction. In addition to the above diseases, other factors can also lead to the symptoms of 13-year-old children have no appetite to eat, it is recommended that timely consultation, identify the causes, and follow the doctor’s instructions for targeted treatment. All of the above medications should be used under medical supervision.