| NOUN | state | hypersensitivity reaction | an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods) |
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| Meaning | 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. | |
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| Narrower | allergic rhinitis | rhinitis caused by an allergic reaction |
| allergy, allergic reaction | hypersensitivity reaction to a particular allergen | |
| anaphylaxis | hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance | |
| urtication, urticaria, hives, nettle rash | An itchy skin eruption characterized by weals with pale interiors and well-defined red margins | |
| Broader | hypersensitivity | pathological sensitivity |
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