What Are the 4 Types of Hypersensitivity Reactions? Explained

Learn about the 4 types of hypersensitivity reactions: Type I to IV, their causes, and how they affect the immune system for targeted treatment.

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Four types of hypersensitivity reactions are: Type I (Allergic) - Immediate reactions like anaphylaxis; Type II (Cytotoxic) - Antibody-mediated cell destruction; Type III (Immune Complex) - Antigen-antibody immune complex deposits; Type IV (Delayed-Type) - Cell-mediated responses causing tissue damage. Identifying the type helps in targeted treatment.

FAQs & Answers

  1. What causes Type I hypersensitivity reactions? Type I hypersensitivity reactions are immediate allergic responses caused by the release of histamine and other mediators from mast cells due to exposure to allergens.
  2. How do Type II hypersensitivity reactions damage cells? Type II hypersensitivity reactions involve antibodies targeting cells, leading to their destruction through processes like complement activation or phagocytosis.
  3. What is the difference between Type III and Type IV hypersensitivity? Type III hypersensitivity is immune complex-mediated caused by antigen-antibody deposits, while Type IV is cell-mediated delayed hypersensitivity involving T-cell responses causing tissue damage.

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