An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »


What is asthma?

Asthma is a disease in your body's airways, which are the paths that carry air to your lungs. Asthma causes the inside walls of the airways to be inflamed or swollen.  When this happens, people have repeated episodes of wheezing, breathlessness, chest tightness or nighttime or early morning coughing.  Asthma is common among children and teens, but anyone can have asthma.  Although there is no cure for asthma yet, asthma can be controlled when patients and doctors work together using medicines and management of environmental triggers.

Learn more about what asthma is, or visit EPA's asthma website.

You can also visit the U.S. Dept. of Health and Human Service's National Institute of Health, National Heart, Lung, and Blood Institute's asthma webpage.