Allergy definition and symptoms

Allergy definition Allergy is an abnormal sensitivity to an ordinarily harmless substance, called an ALLERGEN, that produces a HYPERSENSITIVITY REACTION (allergic reaction) in response to the IMMUNE SYSTEM’s detection of the substance’s presence. A person can have an allergy to nearly any substance. Though researchers understand the mechanisms of hypersensitivity reaction, they do not know what causes the immune system to […]

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Allergy testing

Allergy Testing Definition and Information Allergy Testing is a diagnostic procedures to determine the allergens responsible for HYPERSENSITIVITY REACTION. The most specific ALLERGY test is the allergy SKIN test, also called a scratch test or a patch test. For this test, the allergist uses the inside of the arm or a section of the back to expose the […]

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Anaphylaxis – definition, symptoms and treatment

What is Anaphylaxis and definition Anaphylaxis is a severe HYPERSENSITIVITY REACTION (allergic reaction) in which the tissues of the throat swell, preventing air from getting to the LUNGS. Anaphylaxis, also called anaphylactic shock, is a type I hypersensitivity reaction that often develops rapidly, within minutes to an hour of exposure to the ALLERGEN. Hives, ANGIOEDEMA, and airway spasms are […]

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Angioedema – definition, causes, symptoms and treatment

What is Angioedema and Definition A HYPERSENSITIVITY REACTION (allergic reaction) that produces swelling and fluid accumulation beneath the surface of the SKIN, similar in appearance to URTICARIA (hives). Occurs in response to HISTAMINE release and typically affects the face, especially around the eyes and lips, and can be life threatening when it is severe or if it develops in the throat. […]

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Atopy – Definition, Treatment and Atopic attack

What is Atopy and Definition A genetically predisposed HYPERSENSITIVITY REACTION. Atopy is typically chronic. The most common forms of atopy are atopic: ASTHMA, which affects the airways (bronchi) DERMATITIS, which affects the skin rhinitis, which affects the nasal passages (nose) CONJUNCTIVITIS, which affects the membranes that line the eyelids (conjunctiva) and the sclera (white) of the EYE […]

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