Walnut allergy is a type of tree nut allergy that is common and can cause serious reactions. The allergic reactions occur when the body's immune system mistakenly identifies proteins in walnuts as harmful. Symptoms can range from mild to severe and may include anaphylaxis. Individuals with walnut allergy may also experience cross-reactivity with other tree nuts and foods, making it crucial to identify and manage this allergy carefully....


When should I consider testing for walnut allergy?

Testing for walnut allergy should be considered if you experience allergic symptoms after consuming walnuts or products containing walnuts. Symptoms can include itching, swelling, digestive issues, or difficulty breathing. If these occur, consulting with an allergist for testing can confirm the allergy.

What are common symptoms of walnut allergy?

  • Itching or tingling sensation in or around the mouth and throat
  • Hives or rash
  • Swelling of the lips, tongue, throat, or other parts of the body
  • Abdominal pain, diarrhea, nausea, or vomiting
  • Difficulty breathing, wheezing, or nasal congestion

What causes a walnut allergy reaction?

A walnut allergy reaction is caused by the body’s immune response to specific proteins found in walnuts. The immune system mistakenly identifies these proteins as harmful, triggering an allergic reaction that can range from mild symptoms to severe anaphylaxis.

What are common cross-reactions associated with walnut allergy?

Individuals with walnut allergy may experience cross-reactions with other tree nuts like pecans, almonds, and hazelnuts. Additionally, some may react to foods outside the nut family, such as fruits or seeds, due to similar protein structures. This phenomenon is known as oral allergy syndrome (OAS).

Test(s) that measure/test for Walnut

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