Onion Allergy: Symptoms & Diet Guide | Diets Premium Skip to main content
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Onion

Onions (Allium cepa) contain thiols and profilin (All c 3), triggering oral allergy syndrome (OAS) or contact dermatitis, especially in birch pollen-allergic individuals. Rarely causes anaphylaxis. Cross-reacts with garlic, leeks, and mugwort pollen.

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Symptoms

  • Skin Rash or Hives
  • Itching or swelling of the lips, face, or throat
  • Digestive issues (nausea, vomiting, diarrhea)
  • Shortness of breath or wheezing
  • Anaphylaxis (Severe Allergic Reaction)

Healing & Prevention

  • Avoidance of onions and onion-containing products
  • Antihistamines
  • Epinephrine (for severe reactions)
  • Consultation with an allergist
  • Reading food labels carefully

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