28/09/2025
Hypersensitivity refers to an immune system overreaction to a substance that wouldn't normally be harmful, causing symptoms like allergies, autoimmune diseases, or inflammatory conditions. There are four main types of hypersensitivity reactions, including Type I (IgE-mediated), Type II and Type III (antibody-mediated), and Type IV (cell-mediated), each with distinct mechanisms and timing. Symptoms vary from mild to life-threatening and depend on the type of reaction, with treatments often involving avoiding the trigger or using immunosuppressants.
