Even peanuts, almond, and hazelnut may cause mouth itching in those with birch pollen allergy. For instance, if you are allergic to birch tree pollen, a primary airborne allergen responsible for symptoms in the springtime, you may have reactions triggered by pitted fruit or carrot. In the case of OAS, individuals react to different foods based on what type of seasonal allergies they are affected by. Some people report that only certain varieties of the fruit cause symptoms, for example specific apple varieties. Some people report symptoms with only one food and others with many different fruits and vegetables. OAS can occur at any time of the year.Īlthough there is no definitive test for OAS, affected individuals often have a positive allergy skin test or blood test for specific pollen, along with a history of symptoms after ingestion of the suspected foods.ĭifferent Reactions Based on Different Allergies In a person who is highly allergic, a systemic reaction, called anaphylaxis (an-a-fi-LAK-sis), may be caused by a pollen cross-reactive raw fruit or vegetable, but this is very uncommon. Rarely, OAS can cause severe throat swelling leading to difficulty swallowing or breathing. OAS is generally considered to be a mild form of food allergy. Symptoms usually appear immediately after eating raw fruits or vegetables, although in rare cases, the reaction can occur more than an hour later. The most frequent symptoms of OAS include itchiness or swelling of the mouth, face, lip, tongue and throat. ![]() OAS is a form of a contact allergic reaction that occurs upon contact of the mouth and throat with raw fruits or vegetables. In the case of pollen and foods, the result of cross-reactivity is called oral allergy syndrome (OAS) also known as Pollen Food Allergy Syndrome (PFAS). These proteins can confuse the immune system and cause an allergic reaction or make existing symptoms worse, which is referred to as cross-reactivity. This reaction occurs because the proteins found in some fruits and vegetables are very similar to those found in pollen. This happens in up to 50 to 75% of adults allergic to birch tree pollen. ![]() If you suffer from hay fever (allergic rhinitis) caused by pollen, your mouth or throat may become itchy after eating an apple or celery.
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