Chronic obstructive pulmonary disease (COPD) includes two lung conditions—chronic bronchitis and emphysema. More than 12 million people in the United States have COPD (and COPD is the fourth leading cause of death), but another 12 million have COPD without knowing it.

I Coughed So Hard I Passed Out and Turned Blue

This near-death experience finally got him to quit smoking

My Smoker's Cough Turned Out to Be Emphysema

I use a machine that provides extra oxygen for me to breathe

I'm a Nonsmoker, But I Have Emphysema Due to a Rare Genetic Condition

AAT deficiency is so rare, doctors may miss it

What Is COPD?

Find out more about this serious, long-term illness

I Fought COPD With Pulmonary Rehab and a Lung Transplant

Olson saw pulmonary rehabilitation perform "miracles"