Chronic obstructive pulmonary disease (COPD)

cop4dEnd stage chronic obstructive pulmonary disease (COPD), also referred to as stage 4 COPD, is the most severe stage of the condition. It can cause symptoms such asChronic obstructive pulmonary disease (COPD) is one of the most common lung diseases. Learn more about symptoms, causes, and treatments of COPD at .