Can you explain if it's possible to become allergic to apples?

Yes: Nearly all proteins, especially foreign ones, can induce an allergic reaction in some people. Most of the apple allergic reactions consist of itchy mouth, itchy throat, and or swollen lips in a condition known as Oral Allergy Syndrome. The cause is thought to be from allergy to birch tree pollen which shares a common allergen with apple, celery , and carrot l