Emphysema Definition: Emphysema is a chronic lung disease. It is often caused by exposure to toxic chemicals or long-term exposure to tobacco smoke.

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e-Medicine Health: Emphysema - consumer health resource center providing an overview of emphysema and its causes, symptoms, and treatment.

American Lung Association: Emphysema - explains the condition in which the air sacs in the lungs break down, causing a decrease in respiratory function and breathlessness. Includes notes on the causes, symptoms, and treatment of emphysema.

National Emphysema Foundation - provides resources related to the chronic lung disease.

MayoClinic.com: Emphysema - provides an overview of the chronic obstructive pulmonary disease. Includes signs and symptoms, causes, risk factors, and notes on treatment and prevention.