Cough variant asthma has not been found to have a clear cause, similar to bronchial asthma, mainly related to allergy, genetics, personal constitution, environmental influences, endocrine and so on. 1. Allergic factors: cough variant asthma is commonly found in allergic patients with a personal history of allergy or urticaria, eczema, and elevated blood eosinophil ratio. 2. Genetic factors: asthma is a disease with polygenic genetic predisposition, family aggregation phenomenon, the closer the blood relationship, the higher the prevalence. 3. Environmental factors: pollen, dust mites, hot and cold air, irritating odors, occupational dust environment, as well as fish and shrimp and other high-protein foods and other allergens can trigger cough variant asthma attacks. Cough variant asthma should be found in a timely manner to seek medical treatment, under the guidance of a specialist physician standardized treatment.