An allergic response is a hypersensitive immune reaction to a substance that normally is harmless or would not cause an immune response in everyone.
Allergies, also known as allergic diseases, are various conditions caused by hypersensitivity of the immune system to typically harmless substances in the ...
Anaphylaxis is a serious, potentially fatal allergic reaction and medical emergency that is rapid in onset and requires immediate medical attention ...
Hypersensitivity is an abnormal physiological condition in which there is an undesirable and adverse immune response to antigen. It is an abnormality in the ...
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Allergic contact dermatitis (ACD) is a form of contact dermatitis that is the manifestation of an allergic response caused by contact with a substance; ...
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Type I hypersensitivity (or immediate hypersensitivity), in the Gell and Coombs classification of allergic reactions, is an allergic reaction provoked by re- ...
A food allergy is an abnormal immune response to food. The symptoms of the allergic reaction may range from mild to severe. They may include itchiness, ...
Signs and symptoms include a runny or stuffy nose, sneezing, red, itchy, and watery eyes, and swelling around the eyes. The fluid from the nose is usually clear ...
An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would ...
An allergy is "an acquired, abnormal immune response to a substance (allergen) that does not normally cause a reaction" (Thomas, 1997, pp. 66-67).