hypersensitivitetsreaksjon
Hypersensitivitetsreaksjon describes an exaggerated or inappropriate immune system response to a substance that is normally harmless to most people. This reaction occurs when the immune system mistakenly identifies a foreign substance, known as an allergen, as a threat and initiates a defense mechanism. These reactions can range from mild, such as a skin rash or itching, to severe and life-threatening, like anaphylaxis.
There are four main types of hypersensitivity reactions, classified by Gell and Coombs. Type I, also known
The severity and specific symptoms of a hypersensitivitetsreaksjon depend on the type of reaction, the allergen