When your child has a food allergy, they must follow an allergy-free diet. This means your child can't have the food they're allergic to or any products that contain it. The items that your child is allergic to are called allergens. A peanut allergy is the body's abnormal response to the proteins found in peanuts. A peanut allergy is the leading cause of food allergy-related deaths in the U.S.
Peanuts are very different from tree nuts, such as walnuts, almonds, and cashews. But some people with a peanut allergy also need to stay away from tree nuts. Talk with your child's doctor to find out if your child should also avoid tree nuts.