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Published 12:00 8 Aug 2015 BST
Updated 14:51 7 Aug 2015 BST
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While most allergic reactions are common and considered mild, there are life-threatening and severe reactions in some people.
Most people react to an allergen almost immediately after they come into contact with the substance. This can cause itchiness, or discomfort. The most severe form of allergic reaction is called anaphylaxis, causing anaphylactic shock.
Anaphylaxis is a sudden and severe allergic reaction that occurs within minutes of exposure. Immediate medical attention is needed for this condition. Without treatment, anaphylaxis can get worse very quickly and lead to death within 15 minutes.
What are the most common causes of allergens?
Common allergens in people include:
Shellfish are a common food allergen for many people
These allergens usually cause a mild allergic reaction including hives, itching, nasal congestion, rashes or for your eyes to water.
Symptoms of a moderate or severe reaction include:
If you or a friend suffers from a severe reaction, try to remain calm as anxiety can make symptoms worse.
For a severe allergic reaction (anaphylaxis), check the person's airway, breathing, and circulation. Contact the emergency services as soon as possible and administer any emergency allergy medication if the sufferer has it on hand. Avoid oral medication if the person is having difficulty breathing.
Wait for the emergency services to arrive and try keep the patient calm while waiting for assistance.
How can you be tested for allergic reactions?
The most common way of identifying allergens is by being tested.
This can be done by:


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