Can a child with egg allergy eat egg yolk?

Why are egg white and egg yolk different in how likely they are to cause allergy?

Egg allergy is usually a reaction to proteins in egg white. Egg white contains several proteins that the immune system can recognise, and some of these are major allergens. Egg yolk contains different proteins and is less likely to cause allergy, but it is not free of them.

So some children are allergic only to egg white, and may be fine eating well-cooked egg yolk. But this is only a possibility, not a rule. Egg yolk still contains a small amount of protein, and for highly sensitive children even a tiny amount may trigger a reaction.

How the egg is cooked also affects how likely it is to cause allergy. Thorough cooking may change the structure of some proteins and make them less likely to cause allergy, but how much this happens varies with the type of protein and with the individual child. It cannot be generalised.

Why can't you try giving egg yolk at home yourself?

Parents often think: give a small bite of egg yolk first and see if anything happens. This is risky. The severity of an allergic reaction is hard to predict. A child who only had a rash before may have a more severe reaction next time.

A home setting is not equipped for emergencies. A severe allergic reaction may affect breathing and circulation and needs immediate treatment. When trying it at home, parents are often caught off guard if a fast-moving reaction occurs.

So any change from avoiding a food to relaxing the diet should be made after a doctor's assessment, and observed under conditions where an allergic reaction can be managed. This is not being overly cautious; it is keeping uncontrollable risk to a minimum.

What signs mean it is time to see a doctor?

If your child has any of the following after eating egg or foods containing egg, see a doctor for assessment promptly:

Large areas of urticaria (hives) appearing quickly on the skin, or swelling of the eyelids or lips;

Vomiting, obvious abdominal pain, or repeated diarrhoea;

Cough, wheezing, hoarse voice, or difficulty swallowing;

Low energy, pale face, dizziness, or fainting.

If any of the above has happened before, especially symptoms involving breathing or circulation, a doctor must decide before any further contact with egg. Do not try it yourself just because the last reaction was mild.

How does a doctor decide whether the diet can be relaxed?

The doctor will consider the type and severity of the child's past reactions, the allergen test results, and the form in which egg appears in the diet. Test results alone cannot be used to decide whether the child can eat egg.

If the assessment suggests a trial is possible, it is usually done under controlled medical conditions, starting with a very small amount and observing for enough time before deciding the next step. This process needs professional judgement, and parents should not copy it themselves.

Every child is different, so the pace and extent of relaxing the diet differ too. Some children can eat well-cooked egg yolk, while others still need strict avoidance. For what to do in your child's case, please follow the doctor's individual plan.

This article is for general information only and is not medical advice. Please follow your doctor's instructions.