Since eggs are such a common ingredient in foods, living with an egg allergy can prove challenging. Most people who are allergic are sensitive to the proteins found in egg whites, though some are irritated by the proteins found in the yolk. Symptoms of an egg allergy include wheezing, nausea, headache, stomachache and itchy hives. Egg allergies are common in children, and usually disappear by age 5. Generally, an allergic reaction to eggs occurs a few minutes to a few hours after eating them.