Asthma: About, Types, Drugs and Treatment, Side Effects, and Drug Interactions Introduction Asthma is a heterogeneous chronic inflammatory disorder of the airways, which impacts millions of individuals around the world. It is defined by an increased responsiveness of the trachea and bronchi to various stimuli, causing multiple symptoms, such as wheezing, shortness of breath, cough, and chest tightness. The pathogenesis of SRS is related to the narrowing of the airways, bronchial hyperresponsiveness, and increased production of mucus.