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Oral Allergy Syndrome Cross-Reactions

People who are allergic to tree pollen may experience an itchy mouth or throat after eating apples, celery or other food items during hay fever seasons. This reaction occurs because the proteins found in some fruits and vegetables are very similar to those found in the seasonal pollen. This cross-reactivity is usually called oral allergy syndrome (OAS) but has also been termed pollen fruit syndrome (PFS). For most cases of OAS, individuals react to different foods based on what type of seasonal allergies upon which they are sensitized. The primary pollens involved in OAS reactivities include birch, alder, ragweed, mugwort, Timothy grass and orchard grass. For example, individuals allergic to birch tree pollen may experience reactions to pitted fruits, carrots and various nuts. Similarly, individuals who are sensitized to grasses may have adverse reactions to peaches, celery, tomatoes, melons and oranges. Late summer allergies to ragweed can produce OAS symptoms to banana, cucumber, melon, and zucchini. Knowing your specific allergy trigger is smart. Getting an accurate allergy diagnosis improves lives. Learn More at Hycorbiomedical.com