Oral Allergy Syndrome Overview

ORAL ALLERGY

Oral allergy syndrome (OAS) is caused by cross-reactivity between proteins in fruits and vegetables and pollen. This syndrome occurs in large quantities (up to 70 percent) of people with pollen allergy. The proteins in fruits and vegetables because of the OAS is readily broken down during cooking or processing. Therefore, the OAS does not usually occur with cooked fruit or vegetables and baked, or fruits such as apples.