hypersensitivity reaction

Definitions of hypersensitivity reaction
1

n an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock

Types:
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hives, nettle rash, urticaria, urtication
an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs
allergic reaction, allergy
hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
anaphylaxis
hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance
allergic rhinitis
rhinitis caused by an allergic reaction
anaphylactic shock
a severe and rapid and sometimes fatal hypersensitivity reaction to a substance (especially a vaccine or penicillin or shellfish or insect venom) to which the organism has become sensitized by previous exposure
food allergy
allergic reaction to a substance ingested in food
atopic allergy, atopy, immediate allergy, type I allergic reaction
an allergic reaction that becomes apparent in a sensitized person only minutes after contact
serum disease, serum sickness
a delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum
delayed allergy, type IV allergic reaction
an allergic reaction that becomes apparent only hours after contact
hay fever, pollinosis
a seasonal rhinitis resulting from an allergic reaction to pollen
Type of:
hypersensitivity
pathological sensitivity

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