Chronic inflammation in the airways limits the amount of airflow to the lungs. It is progressive and relates to abnormal inflammatory response in the lungs that affects gas exchange. “This is caused by loss of elastic recoil and airflow obstruction caused by mucosal hypersecretion, mucosal edema, and bronchospasm”. One of the two Chronic Obstructive Pulmonary Disease (COPD) is chronic bronchitis. It is caused when the bronchi and bronchioles become inflamed by exposure to smoke or environmental irritants. Thick mucus production begins due to the inflammatory process, which causes airway obstruction and damage to the alveolar sacs and narrows the airways. The obstructed airway interferes with the normal process of gas exchange. In a non-obstructed
