Diagnostic criteria The clinical features of CVA as described in the Guidelines for the Diagnosis and Treatment of Chronic Cough in Children piloted by the Respiratory Group of the Pediatric Branch of the Chinese Medical Association in 2007 are as follows: ① persistent cough for ≥4 weeks, often with episodes at night and/or early in the morning, exacerbated by exercise, after exposure to cold air, without clinical signs of infection, or ineffective after prolonged antibiotic treatment; ② diagnostic treatment of cough with bronchodilators (iii) Normal pulmonary ventilation with a positive excitation test suggesting airway hyperresponsiveness; (iv) Personal allergy, a family history of allergic disease medicinal, and a positive allergen test can be used as an auxiliary diagnosis; (v) Chronic cough caused by other diseases, among others. Definition CVA is a specific type of asthma in which cough is the only or main clinical manifestation without obvious signs or symptoms such as wheezing and shortness of breath, but with airway hyperresponsiveness. Western medicine Anti-inflammatory drugs: ① glucocorticoids: budesonide inhalation; ② antileukotriene: montelukast; ③ inflammatory mediator blockers: sodium cromoglycate, ketotifen; ④ inflammatory mediator antagonists: solfenadine; Bronchodilators: ① β2-agonists: terbutaline. Salmeterol; ② xanthines: aminophylline; ③ anticholinergics: isoproterenol; the most commonly used trade names at present, such as: sulforaphane, promethazine, keratan, salbutamol, fenagan, mucosolvan sindbestrol ……, etc.