Food allergy

A food allergy is when the body's immune system reacts unusually to certain foods. Reactions usually happen within minutes of eating the food. Common triggers include milk, eggs, peanuts, tree nuts, fish, shellfish, wheat and sesame. Some children grow out of milk and egg allergies.

Last updated Nov 9, 2026

What it is

The main treatment is avoiding the food. People at risk of severe reactions are given adrenaline auto-injectors.

A food allergy is different from a food intolerance, which does not involve the immune system.

Common signs

  • Itchy mouth, throat or ears
  • Raised itchy rash (hives)
  • Swelling of the face, lips or tongue
  • Vomiting or tummy pain
  • Wheezing or difficulty breathing

How it is usually diagnosed

  • Questions about reactions
  • Skin prick tests
  • Blood tests for specific IgE
  • Food challenge under supervision

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Allergy test results
  • An allergy action plan
  • Notes about past reactions
  • Adrenaline auto-injector prescriptions and expiry dates

Questions to ask your doctor

  • Which foods do I need to avoid?
  • Do I need an adrenaline auto-injector?
  • Could I grow out of this allergy?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Swelling of the throat or tongue, difficulty breathing or collapse: use an adrenaline auto-injector if you have one and call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

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