Chronic obstructive pulmonary disease (COPD) describes a chronic state of airway obstruction in the lungs. COPD is associated with a number of respiratory disorders, including emphysema and chronic bronchitis. In some cases, chronic obstruction pulmonary disease occurs with asthma.
Chronic obstruction disease causes lung damage as the disease progresses. Without treatment, the lungs' capacity to move air deteriorates. COPD is a serious disease: it is listed as the fourth leading cause of death in the United States. The vast majority of COPD cases are linked to long-term smoking.
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