The Mayo Clinic indicates that signs of egg allergies include asthma, skin inflammation, allergic nasal inflammation or digestive symptoms, such as cramping, nausea or vomiting. The most severe allergic reaction can include anaphylaxis and can be life-threatening.
Food allergies are caused by the immune system sending antibodies to attack a protein it has misidentified as dangerous, explains HowStuffWorks. Young children often have allergies to eggs, but as Health.com states, many grow out of food allergies by the age of 10. A doctor or allergist can determine for sure if a person's symptoms are a result of allergies to specific foods, says HowStuffWorks.