I have an allergy to milk.
He has a drug allergy.
An allergy is a medical problem that some people get when they eat, breathe or touch certain things.
I can't eat nuts - I have an allergy to them.
These new allergy pills don't help me at all.
2. to be allergic to
Do you have any allergies?
A lot of people are dealing with allergies now.
4. to be allergic