This article is from the Asthma FAQ, by Patricia Wrean and Marie Goldenberg mwg@radix.net with numerous contributions by others.
The most common triggers of asthma are:
- viral respiratory infections, such as influenza (the flu)
or bronchitis;
- bacterial infections, including sinus infections;
- allergic rhinitis;
- irritants, such as pollution, cigarette smoke, perfumes,
dust, or chemicals;
- sudden changes in either temperature or humidity, especially
exposure to cold air;
- allergens, for people with allergies;
- emotional upsets, such as stress; and
- exercise.
 
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