Bronchial asthma (asthma for short) is a common chronic lung disease in pediatric patients, and its incidence has been increasing year by year worldwide in recent years. (1) Age and season of onset: The high incidence of pediatric asthma is from 1 to 6 years old, with the first onset mostly under 3 years old and gradually decreasing after school age. The season of onset is winter, followed by seasonal change and autumn. (2) Causes: The causes of pediatric asthma, especially in infants and young children, are mainly respiratory infections, so it is easy to misdiagnose as various types of respiratory infections; strenuous exercise, smoke and odor stimulation, too sweet or too salty diet (3) Attack symptoms: cough, expiratory dyspnea, “sibilant” wheezing sound in the throat (some families) The typical clinical manifestations are coughing, dyspnea, sibilant wheezing sound in the throat (some family members compare it to “bellows” sound), early lacrimation and sneezing. The sudden appearance and rapid cessation of these symptoms (also called sudden onset and cessation) are important features that distinguish this disease from other inflammatory diseases in the lungs. If you reduce the stimulus, keep quiet and leave the original environment to be well ventilated during the attack, the mild asthma symptoms can often be spontaneously reduced or relieved, and vice versa, the symptoms can be suddenly aggravated. (4) Past and family history: genetic predisposition is more obvious in children with asthma, and the earlier the onset of the disease, the more obvious the correlation. Therefore, if there is a history of asthma, long-term bronchitis or allergic rhinitis in first- or second-degree relatives, they should be followed up regularly and asthma should be highly suspected once the above-mentioned cough and wheezing symptoms appear. Atopic dermatitis (infantile eczema), allergic rhinitis and recurrent respiratory infections are common complications in children with asthma and should be given special attention.