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Onion
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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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Onion

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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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Top categories

Swelling (119) Anaphylaxis (115) Digestive Issues (113) Hives (99) Itching (95) Difficulty Breathing (84) Skin rash (62) Diarrhea (58) Nausea (55) Abdominal Pain (51) Skin Rash or Hives (46) Headache (44) Respiratory Symptoms (43) Oral Allergy Syndrome (OAS) (40) Skin Reactions (36) Nausea or Vomiting (34) Itching or Tingling in the Mouth (33) Anaphylaxis (Rare) (23) Anaphylaxis (severe reaction) (22) Fatigue (22) Swelling (angioedema) (22) Difficulty breathing or wheezing (21) Vomiting (21) Anaphylaxis (Severe Allergic Reaction) (17) Dizziness or Lightheadedness (17) Gastrointestinal Issues (17) Swelling of lips, face, or throat (16) Digestive issues (nausea, vomiting, diarrhea) (12) Dizziness (12) Respiratory problems (12)

Top tags

Antihistamines (214) Epinephrine Auto-Injector (151) Avoidance (116) Medical Consultation (111) Emergency Action Plan (50) Consult an Allergist (48) Topical Creams (44) Reading Labels (41) Hydration (39) Hydration and rest (33) Topical corticosteroids (33) Emergency Care (30) Allergy Testing (28) Reading food labels (25) Dietary adjustments (22) Epinephrine (for severe reactions) (20) Emergency Medical Care (18) Epinephrine auto-injector (for severe reactions) (17) Probiotics (16) Consultation with an allergist (14) Allergy Testing and Immunotherapy (12) Read Food Labels (12) Read food labels carefully (10) Reading food labels carefully (9) Consulting an allergist (8) Cold compress (7) Dietary Substitutes (6) Topical Creams or Ointments (6) Avoidance of Allergens (5) Education and Awareness (5)

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