Pediatric anorexia is first and foremost a manifestation of abnormal feeding behavior, which may or may not be accompanied by abnormalities in gastrointestinal function. In addition to acute and chronic infectious diseases and drug effects, the cause is also related to feeding methods, eating habits, psychosocial, social environment, natural environment and other factors. 1, did not add complementary foods in a timely manner Some studies have confirmed that infants have different sensitivity periods for the addition of complementary foods, taste sensitivity period in infancy 4-6 months, food texture sensitivity period in infancy 6-7 months. skussD, etc. that if this period is not given a variety of flavors, a variety of textures of food, infants often refuse to eat new flavors and different textures of food after one year of age, thus causing partiality and recipe monotony. Some people in China have analyzed the relationship between traditional feeding and anorexia in children, and found that frequent breastfeeding during infancy, weaning age is too large, too late to add complementary foods, and improper varieties and methods can make children anorexic at about one year of age. 2, disease and drug factors Most diseases can lead to a decrease in children’s appetite. Anorexia is especially prominent when suffering from gastroenteritis, peptic ulcer, hepatitis or tuberculosis. When a child is sick and has a fever, the digestive and absorption functions can be reduced, causing the phenomenon of not thinking about eating. Another example is intestinal parasitic infections, chronic constipation or a low-salt diet due to kidney disease, which can also cause a decrease in appetite. After taking some drugs (such as erythromycin, sulfa drugs, etc.), because of its stimulating effect on the gastric mucosa, in addition to causing anorexia, may also be accompanied by abdominal pain and nausea, vomiting and other phenomena, in addition, to children taking too much calcium tablets, vitamin A or D, the child can also appear loss of appetite. 3, poor eating habits or unreasonable diet structure usually give children more snacks; summer intake of cold drinks, too many drinks and meal irregularities; parents pay too much attention to the child’s diet and other adverse factors, can affect the child’s appetite. Some parents spoil their children too much, in the dietary structure, protein (eggs, meat, dairy) or sugar (sweets, chocolate, etc.) accounted for too large a proportion, long-term, not only cause children partiality, picky eating bad habits, but also can cause gastrointestinal digestion and absorption dysfunction. 4, mental factors The central nervous system is affected by the adverse stimulation of the internal and external environment of the human body, through the visceral response of the sympathetic nervous system to make the regulation of digestive function out of balance causing loss of appetite. Children are subject to adverse psychological stimuli, such as fright, fear, tension, etc., may cause digestive dysfunction and loss of appetite; parents demand too much of their children, restricting their children’s activities, such as prohibiting play with other children, reprimanding children before meals and at the table, will affect children’s mood and appetite; when children’s appetite is low, the use of coercive means or intimidation methods to force children to eat, often making children rebellious psychology And refuse to eat. 5, climate factors The weather is too hot or humidity, can affect the nerve regulation function and the secretion of digestive juices and cause children’s appetite loss. Therefore, the phenomenon of poor appetite of children is obvious in summer, which is also called summer anorexia. 6, vitamin B, zinc deficiency of trace elements zinc deficiency affects the synthesis of nucleic acids and proteins, thus affecting the synthesis of gustatory elements. B vitamin deficiency can also cause a decrease in the taste function of children and the digestive function of the gastric mucosa, so that children have no appetite and digestive capacity is reduced. To sum up, the pathogenesis of pediatric anorexia is due to both internal factors and external factors of food and environment. A good appetite is one of the signs of pediatric health, and long-term anorexia is bound to affect the physical and intellectual development of children. A comprehensive understanding of the etiology of pediatric anorexia is of practical importance to control the disease at the onset stage as much as possible and to prevent the disease before it occurs.