Asthma: Causes, Diagnosis and ManagementAbout This Hardback Asthma is a chronic airway obstructive condition that affects the bronchi. It is understood to be caused by a combination of environmental and genetic factors. Exposure to air pollution and allergens can trigger asthmatic episodes, while medications such as beta blockers and aspirin can also act as potential triggers. It is classified as per the frequency of symptoms, peak expiratory flow rate, and forced expiratory volume in one