Why does my mouth always itch after eating apples?

Oral AllergySyndrome: Although not everyone with a pollen allergy experiences oral allergy syndrome when eating the following foods, they are commonly associated with these allergens: Birch pollen: apple, almond, carrot, celery, cherry, hazelnut, kiwi, peach, pear, plum Grass pollen: celery, melons, oranges, peaches, tomato Ragweed pollen: banana, cucumber, melons, sunflower seeds, zucchini. Ref: http://acaai.org