Atopy (say "AT-uh-pee") is a predisposition to have allergic
reactions. People who have this predisposition are called atopic (say "ay-TOP-ick").
Atopic people often
have at least one allergic condition, such as asthma, allergic rhinitis (hay
fever), atopic dermatitis, hives or angioedema, or food allergies. The tendency
to develop these kinds of allergies runs in families.