Type I hypersensitivity

Definition

Type I Hypersensitivity is an immediate allergic reaction mediated by IgE antibodies that occur upon exposure to a specific antigen, leading to symptoms like sneezing, itching, and anaphylaxis in severe cases. It involves the release of histamine and other chemicals from mast cells and basophils.

Related terms

Allergens: Substances that can cause an allergic reaction by being recognized as antigens by the immune system.

Anaphylaxis: A severe, potentially life-threatening allergic reaction that can occur rapidly after exposure to an allergen.

Antigen: Any substance that causes your immune system to produce antibodies against it, which may or may not lead to an allergic reaction