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Last reviewed on: June 29, 2009
Arrow BulletEnvironmental Allergies

What are environmental allergies?

Allergies, also known as allergic rhinitis or hay fever, occur when your immune system overreacts to particles in the air that you breathe. Your body's defence system (immune system) attacks the particles in your body, causing symptoms such as sneezing and a runny nose. The particles are called allergens because they can cause an allergic reaction.


This web page is for information purposes only.
It is NOT a substitute for professional medical advice.

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