What causes asthma?

Updated: Oct 07, 2019
  • Author: John J Oppenheimer, MD; Chief Editor: Michael A Kaliner, MD  more...
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Causes or triggers of asthma can be divided into allergic and nonallergic etiologies. Aeroallergens can include seasonal pollen, mold spores, dust mites, and animal allergens.

Nonallergic causes of asthma can include smoke, odors, cold air and weather, chemicals, medications (eg, aspirin and other nonsteroidal anti-inflammatory drugs [NSAIDs)], beta-blockers), exercise, hormonal changes (eg, pregnancy, menstrual cycle), and bisulfite food additives.

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