|Both asthma and COPD involve inflammation of the airways. Asthma is a chronic inflammatory disorder involving many different cells and cell membranes. It is characterized by reversible airway constriction. It is the most common chronic disease in children, and its prevalence is rising . COPD refers to a collection of conditions, including emphysema and chronic bronchitis, which can affect various structures in the lung. It is characterized by the presence of airflow obstruction and a slow progressive decline in forced expiratory volume in 1 second (FEV1) . COPD is a leading cause of worldwide morbidity and mortality. By 2020, it is expected to become the fifth cause of combined worldwide mortality and disability .