allergic reaction

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pertaining to or having an allergy.
allergic reaction a local or general reaction characterized by altered reactivity of the animal body to an antigenic substance; see also allergy.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

al·ler·gic re·ac·tion

a local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and sensitized; immunologic mechanisms gives rise to inflammation or tissue damage. Allergic reactions are classified into four major types: type I, anaphylactic and IgE dependent; type II, cytotoxic; type III, immune-complex mediated; type IV, cell mediated (delayed).
Farlex Partner Medical Dictionary © Farlex 2012

allergic reaction

Immunology Any response to an allergic stimulus, which can be localized or systemic Clinical Rash, itching, hives, swelling, dyspnea, ↓ BP Lab ↑ IgE, ↑ mast cells, basophils, which release histamine, PGs, LTs, kinins, et al. See Asthma, Hypersensitivity reaction.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

al·ler·gic re·ac·tion

(ă-lĕr'jik rē-ak'shŭn)
A local or general reaction of an organism following contact with a specific allergen to which it has been previously exposed and sensitized.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Allergic reaction

An inappropriate or exaggerated genetically determined reaction to a chemical that occurs only on the second or subsequent exposures to the offending agent, after the first contact has sensitized the body.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

al·ler·gic re·ac·tion

(ă-lĕr'jik rē-ak'shŭn)
Local or general reaction of an organism after contact with a specific allergen to which it has been previously exposed and sensitized.
Synonym(s): hypersensitivity reaction.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about allergic reaction

Q. what cause an allergic reaction?

A. Frankly? no ones actually knows for sure. What we do know, is that due to some reason the immune system of certain people, regard several non-harmful substances (e.g. peanuts, antibiotics, bee's venom) as an enemy and learn to react to it.

This tendency to develop abnormal responses to substances other people don't response to is called "atopy". It has a very strong genetic basis (i.e. it runs in families), and also depends on other factors such as the exposure to infections and the pattern of exposure to the allergen (the substance that causes allergy).

It's a very wide subject, far beyond the scope of my answer, so you may read more here:

Q. Is it common to get an allergic reaction in the eye from olive harvest? I've been around olive trees for a few hours and now feel like I have something in my eye but there is nothing there. can it be an allergic reaction? I dont get it from eating olives...

A. but in one eye..? that just doesn't seem likely. but i guess there is no reason not to try both treatments....

Q. I am worried about the allergic reactions I had from the Chinese herbal drug. I am worried about the allergic reactions I had from the Chinese herbal drug that I took for my arthritis…..are these safe?

A. Many people have some type of reaction to either a drug and even a supplement. You can check with your doc to get tested to see what your sensitivities are. Regarding arthritis, no milk, cheese, yogurt, butter, anything with milk for starters, AVOID like the plague! Suagr consumption too will raise hell with it. There is a product that someone I knew took, called, "Cell Guard" which he bought at a health food store or Whole Foods. After a couple of months, he was pain free. Its worth a try! Cell Guard is made with SOD or "superoxide dismutase"
Studies have shown that SOD can play a critical role in reducing internal inflammation and lessening pain associated with conditions such as arthritis! Check it out! Let me know how you do!

More discussions about allergic reaction
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References in periodicals archive ?
and blocks a central pathway in allergic inflammation and will be studied for the treatment of atopic dermatitis, asthma and other inflammatory conditions.
Several researchers have shown that Treg-specific deletion of IL-10 promoted allergic inflammation [73] suggesting that Treg-derived IL-10 plays a "privileged," nonredundant role in the induction of immune tolerance in allergic airway inflammation.
Allergic inflammation induced by allergen inhalation is associated with high levels of Th2 cytokines IL-4, IL-5, IL-13 and elevated numbers of eosinophils in the BALF [21].
Ohta et al., "Induction of airway allergic inflammation by hypothiocyanite via epithelial cells," Journal of Biological Chemistry, vol.
Kanzler et al., "Human epithelial cells trigger dendritic cell-mediated allergic inflammation by producing TSLP," Nature Immunology, vol.
Mast-cell cytokines are responsible for the initiation of allergic inflammation, resulting in eosinophil infiltration associated with vernal conjunctivitis.
In this paper, we briefly summarize the roles of IL-22 in the regulation of allergic inflammation in asthma.
Various inflammatory cells, cytokines, chemokines, mediators, and adhesion molecules are all involved in the mechanism of allergic inflammation [1].
This opens the door for new ways to look at bacterial-associated allergic inflammation," says John Wherry, an associate professor of microbiology at the University of Pennsylvania, Philadelphia.
Furthermore we show in an acute model of allergic airway disease that following sensitization without adjuvant and challenge of the mice, treatment with medicinal plant extracts inhibits the development of allergic inflammation and AHR.
"Undoubtedly, the emissions coming from diesel generators can cause health problems including bronchial allergic inflammation, acute bronchitis and emphysema," he said.
In another study, 126 children aged 6-17 years who had mild to moderate persistent asthma and lower pulmonary function or higher levels of markers associated with allergic inflammation responded well to ICS therapy.