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Hives (urticaria) are a reaction to the release of histamine into the skin.

Allergies occur when our body overreacts to a 'trigger' or allergen. Common allergies include hay fever, asthma, hives and food allergy.

Peanuts, tree nuts and seeds can all cause allergies with symptoms ranging from milder reactions to a severe allergic reaction (anaphylaxis).

Allergy occurs when the body overreacts to a 'trigger' that is harmless to most people.

Egg allergy is one of the most common causes of allergies in children with symptoms ranging from mild to life-threatening reactions.

Food allergy is an immune response, while food intolerance is a chemical reaction.

Severe allergic reactions (anaphylaxis) and asthma attacks need urgent emergency first aid. In an emergency, always call triple zero (000).

Allergy testing is used to find which substances provoke an allergic reaction.

Some immunisations are recommended for all Australian teenagers.

All medication has the potential to cause allergies but some people can have allergic reactions to specific prescription or over-the-counter medications.