Cough variant asthma (CVA), although not literally asthma, has the same pathogenesis as asthma, and is also a chronic respiratory metabolic inflammatory disease. It is a component of pediatric asthma along with infantile asthma and asthma in children over 3 years of age. Everyone knows that cough and wheezing are the main manifestations of asthma, but most people rarely realize that it may be an asthma attack when there is only one manifestation of chronic cough. The medical definition of cough variant asthma is: (1) Persistent or recurrent cough attacks >1 month, often at night (or early in the morning), with little sputum, aggravated by exercise, without signs of infection, or ineffective with long-term antibiotic therapy. (2) The cough attack can be relieved with bronchodilators (this is a basic condition). (3) A personal history of allergy or a family history of allergy, a hyperreactive airway, and a positive allergen skin test can be used as an auxiliary diagnosis. The etiology of the disease is due to repeated previous respiratory infections that have damaged the airway mucosa, exposed vagal nerve end receptors, and left the airway in a hypersensitive state. The contraction of the small bronchial smooth muscle is triggered by the stimulation of an external substance (allergen), which in turn can directly stimulate the terminal cough receptors and trigger a cough, either as asthma or as irritant cough. This external irritant can be either non-infectious, such as: cold air, pollen, food, dust mites, chemical odors, etc., or infectious (usually viruses, especially syncytial viruses, and rarely bacteria). We often see parents bringing their children to the clinic in the spring and autumn when the temperature is changing, with a long medical history, but without any abnormalities (including routine blood and chest X-ray) except for recurrent coughing for more than one month. For children with high suspicion, experimental treatment with bronchodilators can be used, and the diagnosis can still be confirmed if the symptoms improve quickly. Treatment is based on asthma under the guidance of a physician, and antibiotics are not used when it is clear that there is no infection. Anti-allergic inflammatory disease is the mainstay, even with long-term medication and regular review. Asthma is a chronic and easily recurring disease, in order to make the child recover as soon as possible, then long-term and regular medication is very crucial.