Chronic obstructive pulmonary disease ( COPD ) , also known as chronic obstructive lung disease ( COLD ) , and chronic obstructive airway disease ( COAD ) , among others , is a type of obstructive lung disease characterized by chronically poor airflow .
Chronic Obstructive Pulmonary Disease ( COPD ) , also known as chronic obstructive lung disease ( COLD ) , and chronic obstructive airway disease ( COAD ) , is a collection of diseases which make breathing gradually more difficult .