In some families or among relatives, multiple people may have bronchial asthma. If multiple members suffer from bronchial asthma, is it because they have infected each other? Actually, that's not the case. Bronchial asthma is not contagious. The reason why multiple family members or relatives have bronchial asthma is due to genetics. The closer the familial ties of asthma patients, the higher the incidence of the disease. The more severe the patient's condition, the higher the incidence among their relatives. Therefore, asthma is related to genetics but is not contagious.