If you are someone who suffers from hay fever also called seasonal allergic rhinitis, you may also have experienced itchiness in your mouth, tongue or throat when eating certain foods such as watermelon, peaches or apples.  You may have determined that you are allergic to these foods when in reality, what you most likely have is oral allergy syndrome (OAS) also known as pollen-food syndrome.  OAS is considered to be a mild form of a food allergy.  The symptoms develop quickly after eating certain foods and rarely do they progress to a more serious reaction of severe throat swelling, difficulty breathing or a systemic reaction called anaphylaxis.