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You are here : AllRefer.com > Health > Diseases & Conditions > Anaphylaxis

Anaphylaxis

Alternate Names : Anaphylactic reaction, Anaphylactic shock, Shock - anaphylactic


Definition

Anaphylaxis is a life-threatening type of allergic reaction.

Overview, Causes, & Risk Factors

Anaphylaxis is an severe, whole-body allergic reaction. After being exposed to a substance like bee sting venom, the person's immune system becomes sensitized to that allergen. On a later exposure, an allergic reaction may occur. This reaction is sudden, severe, and involves the whole body.

Tissues in different parts of the body release histamine and other substances. This causes the airways to tighten and leads to other symptoms.

Some drugs (polymyxin, morphine, x-ray dye, and others) may cause an anaphylactic-like reaction (anaphylactoid reaction) when people are first exposed to them. This is usually due to a toxic reaction, rather than the immune system response that occurs with "true" anaphylaxis.

The symptoms, risk for complications without treatment, and treatment are the same, however, for both types of reactions.

Anaphylaxis can occur in response to any allergen. Common causes include:

Pollens and other inhaled allergens rarely cause anaphylaxis. Some people have an anaphylactic reaction with no known cause.

Anaphylaxis rarely occurs. However, it is life-threatening and can occur at any time. Risks include history of any type of allergic reaction.

Pictures & Images

Shock
Shock

Allergic reactions
Allergic reactions

Anaphylaxis
Anaphylaxis

Hives
Hives

Food allergies
Food allergies

Insect stings and allergy
Insect stings and allergy

Allergic reactions to medication
Allergic reactions to medication

Antibodies
Antibodies

   
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Review Date : 4/28/2008
Reviewed By : David C. Dugdale, III., MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Stuart I. Henochowicz, MD, FACP, Associate Clinical Professor of Medicine, Division of Allergy, Immunology, and Rheumatology, Georgetown University Medical School. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.



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