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Definition
By Mayo Clinic staffAllergies occur when your immune system reacts to a foreign substance such as pollen, bee venom or pet dander.
Your immune system produces substances known as antibodies. Some of these antibodies protect you from unwanted invaders that could make you sick or cause an infection. When you have allergies, your immune system makes antibodies that identify a particular allergen as something harmful, even though it isn't. When you come into contact with the allergen, your immune system's reaction can inflame your skin, sinuses, airways or digestive system.
The severity of allergies varies from person to person and can range from minor irritation to anaphylaxis — a potentially life-threatening emergency. While most allergies can't be cured, a number of treatments can help relieve your allergy symptoms.
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- Allergic reactions: Tips to remember. American Academy of Allergy, Asthma and Immunology. http://www.aaaai.org/conditions-and-treatments/library/at-a-glance/allergic-reactions.aspx. Accessed Oct. 1, 2012.
- Pichler WJ. Drug allergy: Classification and clinical features. www.uptodate.com/index. Accessed Oct. 26, 2012.
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- Longo DL, et al. Harrison's Online. 18th ed. New York, N.Y.: The McGraw-Hill Companies; 2012. http://www.accessmedicine.com/resourceTOC.aspx?resourceID=4. Accessed Oct. 25, 2012.
- Anaphylaxis: Tips to remember. American Academy of Allergy, Asthma and Immunology. http://www.aaaai.org/conditions-and-treatments/library/allergy-library/anaphylaxis.aspx. Accessed Oct. 25, 2012.
- Frequently asked questions. American College of Allergy, Asthma & Immunology. http://www.acaai.org/patients/faq/Pages/default.aspx . Accessed Oct. 25, 2012.
- Kim H, et al. Anaphylaxis. Allergy, Asthma and Clinical Immunology. 2011;7(suppl):S6.
- Kliegman RM, et al. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.mdconsult.com/das/book/body/208746819-6/0/1608/0.html. Accessed Oct. 26, 2012.
- Food allergies. Asthma and Allergy Foundation of America. http://www.aafa.org/display.cfm?id=9&sub=20&cont=286. Accessed Oct. 26, 2012.
- Is rinsing your sinuses safe? U.S. Food and Drug Administration. http://www.fda.gov/ForConsumers/ConsumerUpdates/ucm316375.htm. Accessed Oct. 26, 2012.
- Indoor air quality and allergies. Asthma and Allergy Foundation of America. http://www.aafa.org/print.cfm?id=9&sub=18&cont=233. Accessed Oct. 26, 2012.
- Allergy. Natural Medicine Comprehensive Database. http://www.naturaldatabase.com. Accessed Oct. 26, 2012.
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