An egg allergy causes an individual to feel sick within a few minutes of consuming eggs, according to Mayo Clinic. The symptoms vary, but sometimes include upset stomach, vomiting, hives and nasal inflammation. In severe cases, the individual experiences anaphylactic shock.
The proteins in eggs are the cause of the allergic reaction, according to KidsHealth. The immune system sees these proteins as a threat to the body. It tries to fight off the invasion by releasing chemicals, including histamine, resulting in the allergic reaction. For most individuals, the proteins in egg whites are the cause of the reaction; however, others react to proteins from the yolk. Egg allergies are most common in children under age 5 and usually become less severe as the child ages, but a few people remain allergic to eggs throughout their lives.
When an individual is allergic to eggs, avoiding them is the only way to avoid an allergic reaction. Mayo Clinic indicates there are no medications to stop an allergic reaction when consuming eggs or to cure the allergy. Avoiding eggs is difficult as they are included in many processed foods. Individuals with egg allergies should inform health care providers of the allergy as vaccines, including the flu shot, often contain egg protein.