Allergies Health Center
Get News Updates | RSS Help
latest headlines
How Smog Can Affect Allergies and Asthma
Smoke + fog = Smog: What this pollutant can do to make your allergies and asthma symptoms worse.
Top Search Terms for Allergies
Allergy Basics
What Is an Allergy?
Allergies are an abnormal response of the immune system. People who have allergies have an immune system that reacts to a usually harmless substance in the environment. This substance (pollen, mold, animal dander, etc.) is called an allergen.
Allergies are a very common problem, affecting at least two out of every 10 Americans.