Asthma is a disease of the respiratory system, the lungs and the system of air tubes that lead to them. It is a chronic inflammatory condition that causes the tiny air passageways in your lungs (bronchioles) to become narrowed when they react to something in the environment.

How do I know if I have asthma?

What causes an asthma episode?

What are some common asthma triggers?

Frequently Asked Questions about Asthma

For more in-depth information on asthma and asthma resources visit www.lungusa.org/.