Awareness of COPD - The Nation's Fourth Leading Cause Of Death - Is Rising, But Understanding Is Still Low Source: National Heart, Lung, and Blood Institute <br /> Related MedlinePlus Topic: <a href="http://www.nlm.nih.gov/medlineplus/copdchronicobstructivepulmonarydisease.html">COPD (Chronic Obstructive Pulmonary Disease)</a>