If you have bad allergies how often should you be checked?

Allergies: Depends when you were last checked, how they tested you, and who did the testing. If it has been more than 3 years you really should see an allergist to undergo skin prick testing.

Depends: As an adult if you have severe food allergies, you might want to be checked every year or so. For pollen allergies, you only need retesting if you have moved to a new region.