アレルギー (arerugī) means “allergy”

More examples

その食品を食べると、アレルギーが出ます。so no shoku hin o ta be ru to a re ru gī ga de ma su

I get an allergic reaction when I eat that food.

Describes a condition in which the immune system reacts too strongly to a substance that is usually harmless.

本来は害のない物質に対して、免疫の仕組みが過敏に反応する状態。hon rai wa gai no na i bus shitsu ni tai shi te men eki no shi ku mi ga ka bin ni han nō su ru jō tai

アレルギー (arerugī) is a loanword from German Allergie, ultimately based on Greek allos, meaning "other," and ergon, meaning "work."

In English, allergy names the condition, while allergic describes a person or reaction, as in "She is allergic to nuts."