1. What is CVA (1) Definition: CVA is a special type of asthma in which cough is the only or main clinical manifestation without obvious symptoms or signs such as wheezing and shortness of breath, but with airway hyperresponsiveness. (2) Clinical manifestations: The main manifestation is an irritating dry cough, usually more intense, with nocturnal cough as its important feature. Cold, cold air, dust and oil fumes can easily induce or aggravate the cough. (3) Diagnosis: The principles of diagnosis are comprehensive consideration of clinical features, ineffectiveness of conventional anti-cold and anti-infection treatment, positive bronchial excitation test or bronchodilator test, and bronchodilator treatment that can effectively relieve cough symptoms. Diagnostic criteria: (1) chronic cough, often accompanied by obvious nocturnal irritant cough; (2) positive bronchial excitation test, or peak expiratory flow rate with inter-day variability >20%, or positive bronchodilator test; (3) effective bronchodilator treatment. (2) Combined Chinese and Western medicine treatment of CVA The principles of CVA treatment are the same as those of bronchial asthma treatment. Most patients can be treated with small doses of inhaled glucocorticosteroids combined with bronchodilators (β2-agonists or aminophylline, etc.), or with a combination of the two, such as budesonide/formoterol, fluticasone/salmeterol, and if necessary, short-term oral treatment with small doses of glucocorticosteroids. The duration of treatment should be no less than 8 weeks. Anti-leukotriene receptor antagonists have been reported to be effective in the treatment of CVA, but the number of observed cases is small. Chinese medicine treatment: The main symptom is an irritating dry cough with a violent and frequent cough, mainly at night, which is easily triggered or aggravated by cold, cold air, dust and oil smoke. Treatment should be to dredge the wind and relieve spasm, expectoration and cough. Remedies: roasted ephedra, sautéed almonds, windbreak, bupleurum, Schisandra chinensis, orris, heliotrope, cicada, scutellaria, licorice. The root cause of this disease is phlegm, which is hidden in the lung. When the wind attracts it, the phlegm rises with the air, resulting in recurrent attacks of wheezing and coughing, which are difficult to be cured. There are similarities with “wind cough”. Therefore, Ephedra is used to disperse wind-cold qi and has the function of relieving cough; Cicada, Fangfeng and Chaihu search the wind and ventilate the ligaments and desensitize the spasm to dispel wind and relieve spasm; Wuweizi is sour and sweet to transform yin, astringent to the lung and stop cough, suitable for those with prolonged cough; Hanxia and Almond lower qi, dispel phlegm and stop cough and calm asthma; Radix Platycodon grandiflorus is used to treat cough caused by wind evil in the lung; Radix Scutellariae warms the lung and dissolves phlegm; Radix Scutellariae clears heat and dissolves phlegm; Radix Glycyrrhiza retards cough and can harmonize the middle, which plays a harmonizing role in all the above medicines. It also harmonizes the middle of the body and plays a harmonizing role in the above herbs. If the pharynx is uncomfortable, dry throat, itchy throat and choking cough, add peppermint, Radix et Rhizoma, Radix et Rhizoma, Radix et Rhizoma, etc.; add Chen Pi, Poria, dry throat, Radix et Rhizoma, Dendrobium, etc. If the condition persists, add Radix et Rhizoma, Radix et Rhizoma, etc. The night cough is very add white peony, angelica, danpi.