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Brian Gelbman, MD
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There can be multiple triggers for an asthma attack. The most common triggers are probably allergens, and most frequently these are respiratory allergens, they can be dust, they can be mold, anything in the environment which an individual is sensitive to can cause inflammation in the airways and this leads to asthma attack.

But it's not just allergens that affect all asthmatics. Some people can get asthmatic symptoms in response to a virus infection, some people have it in response to acid reflux, others can have it in response to change in temperature or season. A lot of people experience worsening asthma symptoms at night, these would be called nocturnal asthma, others can experience worsening asthma symptoms in response to exercise we would refer to this as exercise induced asthma.