Chronic obstructive pulmonary disease, or COPD disease, refers to a group of diseases that cause airflow blockage and breathing-related problems. It includes emphysema and chronic bronchitis. What is COPD actually? COPD makes breathing difficult for the 16 million Americans who have this disease and for more information visit:https://www.resmed.co.in/respiratory-care/copd/what-is-chronic-obstructive-pulmonary-disease