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What are some common asthma triggers?

Triggers are things that can cause asthma symptoms, an episode or attack, or make asthma worse.  People with asthma may have just one trigger, or they may find that several triggers.

Learn more about common asthma triggers, such as:

  • Secondhand (cigarette) smoke;
  • Dust mites;
  • Molds;
  • Cockroaches and pests;
  • Pets;
  • Nitrogen Dioxide;
  • Outdoor air pollution;
  • Chemical irritants; and
  • Wood smoke.

Find more information about common asthma triggers from our partners.

  • Outdoor air pollution
    • Airnow.gov
  • Cold viruses
    • CDC's Handwashing: Clean Hands Save Lives Website 
    • CDC's Healthy Habits to Prevent Flu Website
  • Running, Playing, and Exercise
    • AAFA's Exercise-Induced Bronchoconstriction (Asthma) Website
    • AAAAI's Exercise and Asthma Website

Be sure to work with your doctor to identify your (or your child's) triggers, then take steps to control these triggers.

Related Questions

  • How does mold affect people with asthma?
  • Can the use of fragrances indoors cause health impacts?

Asthma

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Contact Us about Asthma
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 13, 2025
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