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Asthma
An overview of asthma, common triggers, and how an action plan helps.
Overview
Asthma is a long-term condition in which the airways become swollen and narrow, making it harder to breathe. Symptoms can be mild or severe and often come in flare-ups.
Common triggers
- Colds and other respiratory infections
- Pollen, dust, mold and pet dander
- Smoke and air pollution
- Exercise or cold air
Living with asthma
- Work with your care team on an asthma action plan
- Use controller and rescue medicines as directed
- Know and avoid your triggers
When to get help
Call 911 if breathing is very difficult, lips or fingernails look bluish, or a rescue inhaler is not helping.
Last reviewed: September 30, 2026