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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.

Some immunisations are recommended for all Australian teenagers.

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

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

Many people with asthma find their symptoms can worsen when they are exposed to certain allergens like house dust mite, animal dander, pollen and mould.