Is bronchial asthma contagious? Bronchial asthma is not contagious; it is not an infectious disease. The exact causes of bronchial asthma are not very clear, primarily thought to be related to genetic and environmental factors. Bronchial asthma has a close relationship with genetics, meaning that if parents have asthma, their children and grandchildren might also develop bronchial asthma. The closer the familial relationship, the higher the chances of developing bronchial asthma compared to the general population. This genetic pattern can create the illusion to the general public that bronchial asthma is contagious, but it may be more closely related to genetics.