1, malnutrition the main intrinsic factor of recurrent respiratory infections is malnutrition. Infants and children in breast milk is not enough and did not add the necessary protein, fat and malnutrition caused by timely. It may also be accompanied by rickets and iron, zinc and other trace elements deficiency. Subsequently, damage to the immune system, so that the immune function is reduced, the ability to resist disease is reduced susceptible to infection. 2, environmental hazards in the environment, a large number of smoke, such as sulfur dioxide and carbon monoxide and other harmful substances, through the respiratory tract into the body. When the harmful substances exceed a certain concentration, the body’s resistance decreases, thus inducing respiratory infections. According to some data, the number of recurrent respiratory infections in families where coal is the main fuel is 19 times higher than in other families. Zhang Huimin, Department of Pediatrics, Jinan Hospital of Traditional Chinese Medicine 3, passive smoking nicotine effects on the respiratory tract are well known. When pregnant women or their surroundings smoke, nicotine in the blood can act directly or ask grounded on the uterus and placental arteries, leading to chronic hypoxia in the fetus, respiratory physiological function is congenitally deficient, in infancy is prone to repeated respiratory infections, the chance of infection in such children is 7 times higher than in other children. 4, poor hygiene habits lack of good hygiene habits are most likely to cause recurrent respiratory infections. If the room can not be regularly ventilated, or balcony closed, or with air conditioning, so that the indoor air is not fresh, which will reduce the resistance of the pediatric organism. When there are patients with respiratory or septic diseases around, the germs are spread through the air, which can also increase the chances of respiratory infections in children. 5, improper treatment in repeated respiratory tract infections, especially in bacterial infections, some parents give children to take Chinese medicine or antibiotics, the course of treatment is not sufficient, 2-3 d after medication, the fever a withdrawal on the discontinuation of drugs, although the pathogenic bacteria are temporarily inhibited, but not completely eliminated, so instead the formation of chronic foci, such as chronic tonsillitis, chronic pharyngitis and chronic sinusitis, etc., bacteria in a long-term latent state, once The bacteria are in a long-term latent state, and once they are cold, tired or have a low resistance, they will develop again. But if you give the child abuse of antibiotics, and will lead to bacterial resistance, making it difficult to control the infection. 6, recurrent respiratory infections are also related to asthma. Children with asthma have low immune function and poor lung ventilation, so they are very prone to complications during the onset of infection. The chance of recurrent respiratory infections is 32 times higher in children with asthma than in normal children. 7, parents ignore the child’s foot warmth experts believe that: the feet are the ends of the limbs, poor blood circulation, if the feet are cold, will reflect the changes in the mucous membrane of the upper respiratory tract such as the nose, pharynx, trachea, etc., so that the ability to resist pathogenic microorganisms is reduced, latent in the body of pathogenic bacteria will grow and multiply, so that the child develops. In particular, infants with imperfect thermoregulatory centers and poor ability to protect themselves from cold, coupled with little activity on the ground and cold feet, are very susceptible to respiratory infections. Chinese medicine’s understanding of the pathogenesis of this disease Chinese medicine believes that the main reason for the onset of this disease is that children’s internal organs are delicate, skin is weak, the fence is loose, the function of external defense is poor, the righteousness is not full, and the resistance to disease is weak. In addition, children do not know how to regulate cold and temperature, and do not know how to regulate milk and food, resulting in the deficiency of both lungs and spleen, and the failure to strengthen the external guard. Specific analysis has the following aspects. 1, insufficient endowment, weak constitution if the parents are weak and sickly, or suffer from various diseases during pregnancy, or premature birth, twin births, after birth, the muscles and bones are tender and timid, the skin and hair are lax, not resistant to the invasion of the natural world in the wrong gas, easy to develop. 2, inappropriate feeding, conditioning inappropriate care conditioning easy to damage the spleen and stomach. Liu believes that there are two situations: one is a lack of nutrition, the other is a relative excess of nutrition. Lung and spleen deficiency, spleen deficiency children are prone to partiality and picky eating. Long-term loss of appetite, lung deficiency children’s body surface is not solid easy to produce false sweat, easy to catch a cold. In addition, with the development of the times, the improvement of living conditions. In addition, with the development of the times and the improvement of living conditions, parents spoil their children, children are partial and picky eaters, resulting in an unreasonable diet structure, eating mainly high protein, high calories, resulting in the accumulation of heat in the spleen and stomach, the stomach complex is blocked, that is to say, meat, fish, etc. eat more, but less fruit, vegetables, easy to have internal heat stay volatile, there is internal heat is easy to attract external sensations, the clinical common children’s palms hot, dry stool, the mouth has a bad taste. It is a sign of impending cold and fever. 3, see less windy day, intolerant of wind and cold now children outdoor activities less, the cold environment is weak in adaptive capacity, such as greenhouse flowers, weak intolerance of wind and cold, once the shape of cold drink cold cold that is to. 4, improper medication, damage to the righteousness of pediatric respiratory tract infections are mostly caused by viruses, regardless of Chinese medicine, Western medicine improper use can make resistance to decline. Inappropriate treatment, overdose of antidotes, damage to the Wei Yang, resulting in deficiency of the Wei table gas, Ying and Wei. Decline in physical constitution is prone to invasion by external evil. Inappropriate clinical application of pungent-heat or bitter-cold medicine, pungent-heat hurts yin and bitter-cold hurts yang, so that ying-yin cannot guard internally and sweat more, and guard-yang cannot defend externally. Improper use of antibiotics and hormones can also damage yang and consume yin, resulting in a decrease in resistance and a deficiency of evil, which can lead to an attack.