Allergic reactions to fruit are commonly associated with oral allergy syndrome (OAS). It’s also known as pollen-food allergy. OAS occurs from cross-reactivity. The immune system recognizes the similarity between pollen (a common allergen) and the proteins in raw fruits, vegetables, and tree nuts. That recognition triggers an allergic reaction in some people. Here are the types of pollen and their related fruits that may trigger an OAS reaction:

Birch pollen: apple, apricot, cherry, kiwi, peach, pear, and plum.
Grass pollen: melon, orange
Ragweed pollen: banana, melon
Mugwort pollen: peach

Symptoms:

OAS and fruit allergies can trigger symptoms that range from uncomfortable to severe and even life-threatening. Common signs and symptoms include: itching or tingling in the mouth, swelling of tongue, lips, and throat, sneezing and nasal congestion, lightheadedness, nausea, abdominal pain diarrhea

In some cases, a life-threatening reaction called anaphylaxis may occur. Seek emergency medical attention if you experience any of the following: throat swelling, airway constriction, rapid pulse, dizziness, loss of consciousness, low blood pressure, and shock.

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