Oral Allergy Syndrome

Definition

An allergic reaction limited to the mouth. It is most commonly caused by sensation to fresh fruits and vegetables in patients with allergy to pollens. Direct contact of the inside of the mouth with the fruit or vegetable is necessary for this reaction to occur. 

Prevalence

Approximately 35% of patients allergic to pollens share allergic symptoms and skin test positive results to fresh fruit and vegetables. Adults appear to develop this form of allergy more frequently than children. 

Clinical Feature

Redness, itchiness and occasional swelling limited to inside the mouth.

Cross-Reaction Examples

Birch Pollen:

• Almond, apple, apricot, Brazil nut, carrot, celery, cherry, fennel, hazelnut, orange, parsnip, peach, peanut, pear, plum, potato, rutabaga, strawberry, tomato, walnut

Mugwort (weeds):

• Apple, carrot, celery, kiwi, peanut

Ragweed:

• Banana, cantaloupe, chamomile, cucumber, honey, honeydew, watermelon, zucchini

Grass Pollen:

• Apple, carrot, celery, melon, watermelon

Latex:

• Avocado, banana, chestnut, kiwi, papaya, pear, pineapple, potato

Treatment

Avoidance of offending food.