A food allergy occurs when the body’s immune system sees a certain food as harmful and reacts by causing symptoms. This is an allergic reaction. Foods that cause allergic reactions are knowns as allergens.
Allergy to cow’s milk is the most common food allergy in infants and young children. A milk allergy is an immune reaction to one of the many proteins in animal milk, although it is most often caused by the alpha S1-casein protein in cow's milk.
Eggs are one of the most common allergy-causing foods for children. Egg allergy can occur as early as infancy. Most children, but not all, outgrow their egg allergy before adolescence.
Peanut allergy is the most common serious food allergy in children. Allergic reactions to peanuts are often mild, but can sometimes cause a severe reaction called anaphylaxis.
Some children are allergic to just one type of legume; others are allergic to more than one. Allergy to soy is more common in infants and children than teens and adults but can develop at any age.
Wheat intolerance is a general medical term that may reference either a wheat allergy or celiac disease. A wheat allergy is an immune system reaction that affects various parts of your body and could lead to life-threatening reactions.
The most common symptoms of a fish allergy appear on your skin; such symptoms include eczema, hives, and swelling. Other common symptoms of a fish allergy include digestive problems like vomiting, nausea, and diarrhea.