What Is the First Stage of Allergy? Understanding Sensitization Explained

Learn about the first stage of allergy—sensitization—when the immune system reacts to harmless substances, setting the stage for future allergic reactions.

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The first stage of an allergy is sensitization. This occurs when your immune system mistakenly identifies a harmless substance (allergen) as a threat. Upon first exposure, your body produces specific antibodies, but no symptoms occur until future exposures trigger an allergic reaction.

FAQs & Answers

  1. What happens during the allergy sensitization stage? During sensitization, the immune system mistakenly identifies a harmless substance as a threat and produces specific antibodies, but symptoms do not appear until later exposures.
  2. Can allergies develop suddenly after sensitization? Yes, after sensitization, repeated exposure to the allergen can trigger allergic reactions, causing symptoms to appear suddenly.
  3. What are common allergens that cause sensitization? Common allergens include pollen, dust mites, pet dander, insect stings, certain foods, and mold spores.

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