People with asthma have very sensitive airways that react to many different things in the environment called "asthma triggers." Contact with these triggers cause asthma symptoms to start or worsen. The following are common triggers for asthma:
- Infections such as sinusitis, colds, and flu
- Allergens such as pollens, mold spores, pet dander, and dust mites
- Irritants such as strong odors from perfumes or cleaning solutions, and air pollution
- Tobacco smoke
- Exercise, called exercise-induced asthma
- Weather; changes in temperature and/or humidity, cold air
- Strong emotions such as anxiety, laughter or crying, stress
- Medications, such as aspirin-sensitive asthma
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