What Triggers Asthma? Topic Guide

What Triggers Asthma? What Triggers Asthma?: Asthma is usually caused by an immune system response to a substance in the lungs. Common asthma triggers may include exposure to an allergen (pollen, ragweed, dust mites, mold, or animal dander), irritants in the air (smoke, strong odors, chemical fumes), illness (especially respiratory illness or the flu), stress, certain medications, some foods, exercise, extreme weather conditions, panic, and physical display of strong emotion that affects normal breathing patterns (laughing, crying, or shouting).

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