The main cause of cough variant asthma causing chronic cough is a paroxysmal cough, characterized by a dry cough or, if sputum is present, it is less sputum, more viscous and not easily coughed up. The persistent cough often attacks at night and early in the morning and there are no clinical signs of infection. In cough variant asthma the cough is significantly reduced with diastolic bronchial medication. If the cough lasts longer than 8 weeks, cough variant asthma should be highly suspected. Cough variant asthma is essentially asthma, a specific type of asthma with a long-lasting, persistent and unrelieved cough, mainly irritant cough. It can be triggered by exposure to allergens, cold air and emotional stress. Effective anti-asthmatic treatment is one of the diagnostic criteria for cough variant asthma. A positive allergen test can aid in the diagnosis. Allergen testing can also help patients identify their own allergens so that they can avoid exposure and get better control of the disease. Asthma is a common respiratory disease, characterized by characteristic respiratory symptoms and changes in lung function consistent with asthma, and can be divided into different types according to clinical conditions.