The main factors that cause anorexia are: (1) poor eating habits and irregular lifestyle. That is, the feeding method is unreasonable, one-sided pursuit of high protein, high fat or senior nutritional tonic, eat candy and other snacks before meals, resulting in children’s appetite loss, partiality, or eating irregularly, hungry a meal full a meal, life irregularity and other reasons caused by the digestive system dysfunction. (2) The influence of mental factors. That is, excessive restrictions on children’s indoor and outdoor activities or preschool education early line, take the way to force feeding, strong fright, excessive excitement, change of living environment, etc., can cause children’s emotions change, so that the excitability of the food center changes easily form this disease. In addition, excessive heat and humidity can affect neural regulation and enzymes and vitality, which are also causes of anorexia nervosa, and if anorexia nervosa is not corrected for a long time, it can lead to severe malnutrition and extreme weakness.