– Allergic rhinitis (hay fever) - reactions to plant pollen or house dust mites in the upper respiratory tract - mucosal edema, mucus secretion, coughing, sneezing, difficult in breathing - also …

There are four types of hypersensitivity reactions, which can range from mild allergies to life-threatening emergencies. Hypersensitivities can also cause long-term conditions, like …

Allergists recognize four types of allergic reactions: Type I or anaphylactic reactions, type II or cytotoxic reactions, type III or immunocomplex reactions and type IV or cell-mediated reactions.

Hypersensitivity (also called hypersensitivity reaction) is an immune response characterized by mechanisms that cause significant tissue damage or physiological dysfunction, whether …

Apr 29, 2025 · There are four main types of hypersensitivity reactions, each with distinct immunological processes and clinical manifestations. Immediate hypersensitivity, often …

Nov 27, 2023 · A hypersensitivity reaction is an extreme or unnecessary immune response that the body has to an antigen. There are four different types of hypersensitivity reactions.

Jun 3, 2025 · Learn the four types of hypersensitivity reactions with clear mnemonics and clinical vignettes. Perfect for USMLE Step 1, Step 2 CK, and immunology review.

Aug 28, 2024 · Hypersensitivity is increased reactivity or increased sensitivity by the animal body to an antigen to which it has been previously exposed. The term is often used as a synonym …

Jan 28, 2020 · Hypersensitivity reactions are categorized into four major types: type I, type II, type III, and type IV. Type I, II, and III reactions are the result of antibody actions, while type IV …

Several types of hypersensitive reactions can be identified, reflecting differences in the effector molecules generated in the course of the reaction. Gell and Coomb described four types of …