Egg Allergy: Symptoms, Causes, and Management

Key Takeaways

• Egg allergy happens when the immune system reacts to proteins in eggs.
  
• Symptoms can range from mild skin reactions to life-threatening anaphylaxis.
  
• Infants, children, and people with eczema or other allergies are more at risk.
  
• Diagnosis is confirmed through skin prick tests, blood tests, and oral food challenges.
  
• Management requires strict avoidance and an anaphylaxis action plan.
  
• Many children outgrow their egg allergy by school age, but not all.
  
• Reading Australian food labels is crucial to identify hidden egg ingredients.
  

What Causes Egg Allergy?

The immune system reacts to specific proteins found in eggs, primarily ovomucoid, ovalbumin, ovotransferrin, and lysozyme.

Egg White Proteins

Most allergic reactions are triggered by proteins in egg whites, particularly ovomucoid and ovalbumin.

Egg Yolk Reactions

While less common, egg yolks can also trigger allergic reactions in some sensitive individuals.

Who Is at Risk?

Children and Infants

• Infants and young children are more likely to develop egg allergy, although many outgrow it.
  
• Children with eczema or other food allergies are at higher risk.
  

Adults with Other Allergies or Eczema

• Adults can develop egg allergy, even if they previously tolerated eggs.
  
• People with a family history of allergies or asthma are more prone.
  

Common Symptoms of Egg Allergy

Egg allergy symptoms typically appear within minutes to two hours after exposure. Severity varies depending on age, exposure type (eating vs skin contact), and sensitivity.

Skin Reactions

• Hives (raised, itchy welts)
  
• Eczema flare-ups
  
• Redness or swelling, especially around the mouth or eyes
  
• General itching
  

Respiratory Symptoms

• Sneezing
  
• Runny or blocked nose
  
• Coughing
  
• Wheezing
  
• Shortness of breath
  

Gastrointestinal Symptoms

• Nausea
  
• Vomiting
  
• Abdominal cramps
  
• Diarrhoea
  

Cardiovascular Symptoms

• Light-headedness
  
• Rapid heartbeat
  
• Dizziness
  
• Drop in blood pressure
  

Severe Reactions: Anaphylaxis

Anaphylaxis is a life-threatening medical emergency and requires immediate attention.

Signs of Anaphylaxis

• Swelling of the tongue and throat
  
• Difficulty breathing or talking
  
• Hoarseness or noisy breathing
  
• Pale skin, confusion, or collapse
  
• Severe drop in blood pressure
  

Emergency Response

• Call 000 immediately
  
• Administer adrenaline (EpiPen) if available
  
• Lay the person flat and elevate their legs if possible
  
• Do not allow them to stand or walk
  

How Egg Allergy Symptoms Differ by Age

Infants

• Refusal to feed
  
• Vomiting
  
• Colic-like crying
  
• Skin rashes around the mouth
  
• Diarrhoea
  

Children and Adults

• Hives and itching
  
• Respiratory symptoms
  
• Digestive discomfort
  
• Adults may also experience anxiety after past allergic episodes
  

Diagnosing Egg Allergy

Diagnosis usually begins with a GP visit, followed by referral to an allergist or immunologist.

Skin Prick and Blood Tests

• Skin prick test: Egg proteins are introduced to the skin; a raised wheal indicates sensitivity.
  
• Blood test (IgE): Measures egg-specific antibodies.
  These tests confirm sensitisation but don’t predict severity.
  

Oral Food Challenge

The most accurate diagnostic method. Conducted under medical supervision, it involves eating small amounts of egg to monitor for a reaction.

Managing Egg Allergy

The best management is strict avoidance of eggs and being prepared for emergencies.

Avoiding Hidden Sources

Egg is often found in:

• Baked goods (cakes, biscuits, pastries)
  
• Mayonnaise and dressings
  
• Pasta
  
• Ice cream
  
• Some processed meats
  

Always read FSANZ food labelling carefully, especially “may contain traces of egg” warnings. The key to managing egg allergy is strict avoidance and awareness of cross-contact risks during food handling and preparation.

Medication and Emergency Plans

• Antihistamines for mild reactions
  
• Adrenaline auto-injectors (EpiPen) for anaphylaxis
  
• An anaphylaxis action plan developed with your doctor
  

Part of good food safety practices includes having an anaphylaxis action plan ready in case of accidental exposure.

Living with an Egg Allergy

Workplace and School Considerations

• Inform your employer, colleagues, or school about your condition.
  
• Take extra precautions in food-handling environments to reduce cross-contact risks.
  

Psychological and Social Impact

• Egg allergy can cause anxiety about dining out or travelling.
  
• Support groups and professional counselling can improve confidence and quality of life.
  

Frequently Asked Questions

What are the first signs of an egg allergy?

Hives, itching, facial swelling, or vomiting within minutes of exposure are common first signs.

Can adults develop an egg allergy?

Yes. While rare, adults can develop an egg allergy even if they previously tolerated eggs.

How quickly do egg allergy symptoms appear?

Symptoms usually occur within minutes to two hours after eating eggs.

What is the difference between egg intolerance and egg allergy?

Intolerance affects digestion and does not involve the immune system, whereas an allergy can trigger immune reactions, including anaphylaxis.

Is egg allergy dangerous?

Yes, particularly because it can cause life-threatening anaphylaxis.

Can you be allergic to egg yolk but not egg white?

Yes, though it’s more common to react to egg white proteins.

How is egg allergy diagnosed in Australia?

Through skin prick tests, blood tests, and oral food challenges by a specialist.

What foods should I avoid if I have an egg allergy?

Avoid foods with egg or egg-derived ingredients like albumin, lysozyme, or globulin.

Can egg allergy cause anaphylaxis?

Yes, egg allergy is a recognised cause of anaphylaxis.

Will my child outgrow their egg allergy?

Many children outgrow egg allergy by adolescence, though not all.