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Asthma is caused from allergens that are in the air, or infections like a cold. People also can get asthma from air pollutants or medications. Look here for more information: http
http://answers.ask.com/Health/Diseases/what_causes...
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Asthma can be caused by factors such as airborne allergens like dust mites, cat and dog dander or cigarette smoke. There is no exact cause of asthma but scientists are continuing
http://answers.ask.com/Health/Diseases/what_are_th...
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One thing about asthma there is really no known reason or exact cause of asthma. Asthma have seemed to be inherited, or when you are a child and have so many upper and lower lung
http://answers.ask.com/Health/Diseases/what_is_the...
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Asthma can be caused by numerous factors, it generally isn't just one thing that triggers it. I could be an allergy to animals, or it could be smoke or pollen. There is treatment
http://answers.ask.com/Health/Diseases/how_is_asth...
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