An allergy is an exaggerated immune response where the body mistakenly identifies an ordinarily harmless allergen as a threat. [11][12][13][14] Allergic reactions give rise to allergic diseases …

Jul 7, 2025 · An allergy is an immune system response to a foreign substance that’s not typically harmful to your body. Learn more about the types, causes, and symptoms of allergies, and …

Apr 1, 2025 · Learn more about allergies, your immune system’s overreaction to something that’s not harmful — like pollen, pet dander and certain foods.

Nov 7, 2024 · Los síntomas de la alergia pueden variar de leves a graves, incluso del tipo que ponen en riesgo la vida. Infórmate sobre los tratamientos y los consejos de prevención que …

Nov 20, 2023 · Learn about different types of allergies, allergic reactions, their types, symptoms, and severity.

Nov 19, 2025 · An allergy is a reaction by your immune system. Substances that cause reactions include pollen and food. Find the full list of allergies and symptoms.

Read about allergy treatment, symptoms, testing, shots, and medicine. Learn about the types of allergies (asthma, allergic rhinitis, seasonal, conjunctivitis, eczema ...

Allergies exist in many different forms. Tap here to find out about the symptoms of and how to manage and treat the allergy you suffer from.

A complete guide to understanding allergies. Include how and why they occur, and the different types of allergies and various symptoms.

An overview of allergy symptoms, allergy diagnosis, allergy treatment and allergy management written by leading experts in allergy, asthma and immunology.