05/20/2015 03:24 PM EDT
An allergic reaction is a specific response of the body’s immune system to a normally harmless substance called an allergen. A variety of environmental allergens, such as pollen and animal dander, can trigger allergic reactions in the nose (allergic rhinitis, or hay fever) and in the lung (asthma). Not all reasons for susceptibility to environmental allergies are understood, although a family history of allergies is an important risk factor. NIAID supports and conducts research aimed at understanding how allergic rhinitis and asthma develop and identifying new strategies to diagnose, treat, and prevent environmental allergies.
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