A hypersensitivity reaction happens when the immune system mistakenly identifies harmless substances as harmful. There are several types of hypersensitivity reactions, depending on the class of ...

There are four different types of hypersensitivity reactions. We discuss the RA hypersensitivity type, what causes it, and how this type of reaction is diagnosed and treated. Learn more about RA.

[1] Hypersensitivity Reactions to Taxanes: A Comprehensive and Systematic Review of the Efficacy and Safety of Desensitization. Clinical Reviews in Allergy & Immunology (2023).

Patch testing detects allergic contact dermatitis, a type IV hypersensitivity reaction. However, this allergy test cannot identify the cause of urticaria (hives) or food allergy.