Cross-reactivity in allergic reactions occurs when the proteins in one substance (typically pollen) are similar to the proteins found in another substance (typically a food). For example, if you are allergic to birch tree pollen, you may also find that eating apples causes a reaction for you. Certain tree nuts also demonstrate cross-reactivity.
Learn more about food allergy symptoms, diagnosis, treatment and management.
The potential for cross-reactivity can make diagnosing specific allergies somewhat complicated. If you think you have symptoms of a cross-reactivity, an allergist / immunologist, often referred to as an allergist, can help. An allergist has advanced training and experience to test which allergens are causing your symptoms and prescribe a treatment plan to help you feel better and live better.
The AAAAI's Find an Allergist / Immunologist service is a trusted resource to help you find a specialist close to home.