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What Causes Asthma?
People with asthma have very sensitive airways that react to many different things in the environment called "triggers." Contact with these triggers cause asthma symptoms to start or worsen. The following are common triggers for asthma:
* Infections (colds, viruses, flu, sinus infection)
* Allergens such as pollens, mold spores, pet dander and dust mites
* Irritants such as strong odors from perfumes or cleaning solutions, air pollution,
* Tobacco smoke
* Exercise or exertion
* Weather -- changes in temperature and/or humidity, cold air
* Strong emotions such as anxiety, laughter or crying, stress
Source: WebMD "Asthma Guide"
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My asthma flares when I'm stressed emotionally or physically.