Collocations for allergy - noun

food
milk, nut, peanut, penicillin, pollen, etc.
respiratory
bad, life-threatening, serious, severe

have, suffer from
develop
diagnose
cause, trigger
Hair and feathers can trigger allergies.

prevent, treat

sufferer
specialist
You may wish to consult a food allergy specialist for help in planning your diet.

symptom
attack
test
drug, medication (esp. AmE), medicine (esp. AmE), shot (AmE)
In severe cases your doctor may recommend allergy shots.

season
the beginning of the allergy season

allergy to
He developed an allergy to pollen.

allergy in
Eggs are common sources of food allergies in children.