Allergic rhinitis:Medical term forhay fever, an allergic reaction that mimics a chronic cold. Symptoms includenasalcongestion, a clearrunny nose, sneezing, nose and eye itching, and tearing of the eyes. Postnasal dripping of clear mucus frequently causes a cough, loss ofsmellis common, and occas...
Medical Encyclopedia pertaining to an allergy:allergic to peanuts Not to be confused with: allergen– any substance that induces an allergy, such as pollen, grasses, certain foods, and medications allergy– an abnormal reaction of the body to an allergen, manifested by runny nose, skin rash, ...
Define allergic reaction. allergic reaction synonyms, allergic reaction pronunciation, allergic reaction translation, English dictionary definition of allergic reaction. Noun 1. allergic reaction - hypersensitivity reaction to a particular allergen; symp
During a reaction, your immune system releases antibodies. These are proteins that deliver a message to cells: Stop that substance! The cells then send out histamine, which causes blood vessels to expand, and other chemicals, and these trigger the allergy symptoms. ...
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Allergic contact dermatitis:A red, itchy, weepy reaction where the skin has come into contact with a substance that theimmune systemrecognizes as foreign, such aspoison ivy, poison oak or poison sumac or certain preservatives in creams and lotions. This type of reaction reflects a specific sensit...
A delayed type IV allergic reaction of the skin with varying degrees of erythema, edema, and vesiculation resulting from cutaneous contact with a specific allergen. Synonym(s): contact allergy. Medical Dictionary for the Health Professions and Nursing © Farlex 2012 dermatitis (der?ma-tit'is...
A type I hypersensitivity reaction occurs when the immune system produces an overabundance of IgE antibodies to counteract an allergen. Learn more about the pathophysiology of type I hypersensitivity and discover how it relates to anaphylactic shock. ...
During a reaction, your immune system releases antibodies. These are proteins that deliver a message to cells: Stop that substance! The cells then send out histamine, which causes blood vessels to expand, and other chemicals, and these trigger the allergy symptoms. ...
The reaction can start soon after you take the medicine, or days or weeks after you stop. Healthcare providers cannot know ahead of time if you will have an allergic reaction. Your immune system may become sensitive to the antibiotic the first time you take it. You may have an allergic ...