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Allergic Conditions: Anaphylaxis Anaphylaxis is the most severe form of allergic reaction. It is a rapid, immune-mediated, systemic reaction to allergens that a person has been previously exposed to. The reaction occurs rapidly and often dramatically, and is usually unanticipated. Signs and symptoms arise systemically and may include faintness, severe difficulty breathing, and throat closing. Symptoms generally start within 15 to 30 minutes from exposure to an allergen, occasionally begin after 1 hour, and rarely occur hours later. Anaphylaxis is always a medical emergency and immediate care is needed. Resources about anaphylaxis: Please visit an allergist for more information on allergic disease and your individual medical condition. If you need to locate an allergist in your area, visit the Academy’s online Physician Referral Directory. |
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© 1996-2008 · All Rights Reserved · American Academy of Allergy Asthma & Immunology |
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