Definition: An asthma trigger is a substance or event that sets off asthma symptoms. There are many different asthma triggers. Triggers vary from person to person, but here are some of the most common:
- Dust
- Pollen
- Animal Dander
- Breathing Cold Air
- Exertion
- Reactions to Foods or Medications
- Workplace Chemicals
- Cigarette Smoke
Pronunciation: TRIH-GUR
Also Known As: allergens, asthma causes,irritants
Examples: Whenever I pet my neighbor's cat, it triggers my wheezing and other asthma symptoms.

