Cough variant asthma is a specific type of asthma in which cough is the only or main clinical manifestation without obvious symptoms such as wheezing and shortness of breath, but there is airway hyperresponsiveness. The onset of the disease may be related to genetic factors, environmental stimuli, or psychosomatic factors. 1. Genetic factors: cough variant asthma usually has a genetic predisposition, if there are patients with cough variant asthma in the family, the probability of the offspring suffering from this disease will increase. 2. Environmental stimuli: Usually, patients with cough variant asthma will react to certain allergens in the outside world, such as pollen, dust mites and fungi. 3. Mental and psychological factors: If the patient is in a state of long-term high pressure or has strong emotional fluctuations, it may lead to the formation and attack of cough variant asthma. Patients with cough variant asthma need to avoid or reduce exposure to possible allergens, go to a regular hospital in time to identify the cause, and under the guidance of the doctor for treatment.