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Allergy is defined as an exaggerated immune response to an allergen that is usually harmless to most people.
An allergy is an exaggerated immune response in which the body mistakenly treats an ordinarily harmless substance (an allergen) as a threat. This misidentification leads to allergic reactions and can result in allergic diseases such as hay fever (allergic rhinitis), allergic conjunctivitis, allergic asthma, atopic dermatitis, food allergies, and anaphylaxis. Allergic reactions occur when an allergen is recognized by the immune system, commonly involving IgE antibodies. IgE binds to the allergen and then to receptors on mast cells or basophils, triggering the release of inflammatory chemicals such as histamine. These mediators cause symptoms that may involve the skin (itchy rash, hives), airways (sneezing, coughing, wheezing, shortness of breath), and the gut (vomiting, diarrhea, abdominal discomfort).
Allergy is defined as an exaggerated immune response to an allergen that is usually harmless to most people.
A common mechanism involves IgE antibodies binding allergen and activating mast cells/basophils to release inflammatory mediators like histamine.
Allergic reactions can affect multiple body systems and underlie conditions such as allergic rhinitis, asthma, atopic dermatitis, food allergy, and anaphylaxis.
An allergy is an exaggerated immune response where the body incorrectly identifies a harmless allergen as a threat.
A heightened immune reaction that produces symptoms and inflammation beyond what is needed for harmless exposures.
A substance that triggers an allergic reaction in sensitized individuals.
An antibody class that binds allergens and helps initiate allergic reactions by activating mast cells or basophils.
Immune cells that release inflammatory chemicals (e.g., histamine) when activated during allergic responses.
An inflammatory chemical released during allergic reactions that contributes to symptoms such as itching, swelling, and redness.
A severe, potentially life-threatening systemic allergic reaction that can involve multiple organ systems and may include airway swelling and low blood pressure.
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