Overview

Allergy to soy, a product of soybeans, is a common food allergy. Often, soy allergy starts in infancy with reaction to soy-based infant formula. Although most children outgrow soy allergy, some carry the allergy into adulthood.

Mild signs and symptoms of soy allergy include hives or itching in and around the mouth. In rare cases, soy allergy can cause a life-threatening allergic reaction (anaphylaxis).

If you or your child has a reaction to soy, let your doctor know. Tests can help confirm a soy allergy.

Having a soy allergy means avoiding products that contain soy, which can be difficult. Many foods, such as meat products, bakery goods, chocolate and breakfast cereals, may contain soy.