Cough variant asthma, also known as cough asthma, used to be called “allergic bronchitis” or “allergic cough” or “cryptogenic asthma”. The disease was first reported by Gluser in 1972 and named variant asthma. Cough variant asthma is a specific type of asthma in which chronic cough is the main or only clinical manifestation. In the early stages of asthma onset, about 5-6% have a persistent cough, mostly at night or in the early hours of the morning, often irritating, which is often misdiagnosed as bronchitis. cough variant asthma is clearly considered to be a form of asthma in GINA, and its pathophysiological changes are the same as those of asthma, with a persistent airway inflammatory response and airway hyperresponsiveness. The pathogenesis of cough variant asthma is currently considered by most scholars to be the same as that of typical asthma, which is an airway allergic inflammatory disease. Both cough variant asthma and typical asthma have airway allergic inflammation and airway hyperresponsiveness, and the pathogenesis and pathogenesis are very similar, except that the severity or the stage of progression of the disease varies. The prevalence of cough variant asthma is higher in children, and more than 30% of dry cough in children has been found to be associated with cough variant asthma. Because the disease is characterized by cough as the only symptom, the clinical features lack specificity and the misdiagnosis rate is very high. Its clinical manifestations: cough may be the only symptom of asthma and is mainly a prolonged and persistent dry cough, often triggered by inhalation of irritating odors, cold air, exposure to allergens, exercise or upper respiratory tract infections, with some children having no trigger. Some children do not have any triggers. The cough often worsens at night or in the early morning. Some children have seasonal attacks, mostly in spring and autumn. Most of the children have been treated with cough suppressants and antibiotics for some time with little or no effect at the time of consultation, while the application of glucocorticoids, anti-allergic drugs, β2 agonists and theophyllines can provide relief. Diagnosis of cough variant asthma (in children regardless of age) 1. persistent or recurrent cough attacks for more than 1 month, often at night and/or early in the morning or aggravated by exercise, with little sputum and no clinical signs of infection, or ineffective with longer-term anti-infective treatment; 2. bronchodilator treatment can relieve cough attacks (basic diagnostic condition); 3. may have a personal history of allergy or family history of allergy and positive allergen test 4. the airways are characterized by hyperresponsiveness, with a positive bronchial excitation test (auxiliary diagnostic condition); 5. except for other causes of chronic cough.