Soy, a product of soybeans, is a common food that can cause allergies. In many cases, soy allergy starts with a reaction to a soy-based infant formula. Although most children eventually outgrow a soy allergy, soy allergy may persist into adulthood.

Often, signs and symptoms of soy allergy are mild, such as hives or itching in 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. If you have a soy allergy, you'll need to avoid products that contain soy. This can be difficult, however, as soy is common in many foods, such as meat products, bakery goods, chocolate and breakfast cereals.

May. 20, 2011