Table of Contents

What Is an Egg Allergy?

An egg allergy occurs when the immune system mistakenly identifies proteins found in eggs as harmful substances, triggering a range of allergic reactions. These can vary from mild to severe.

It is important to distinguish between an egg allergy and egg intolerance. While an egg allergy involves the immune system and can lead to serious symptoms, egg intolerance typically causes digestive discomfort without involving the immune response.

Immune System Response to Egg Proteins

When someone with an egg allergy consumes egg, their immune system produces immunoglobulin E (IgE) antibodies. These antibodies release chemicals such as histamine, leading to allergy symptoms. There are two main types of immune responses:

IgE-Mediated Allergy

Symptoms appear quickly after exposure, often within minutes.

Non-IgE-Mediated Allergy

Symptoms are delayed and typically affect the gut, causing digestive issues.

Egg White vs Egg Yolk Allergy

Most egg allergies are triggered by proteins in egg whites, such as ovalbumin. However, some people react to egg yolk proteins as well. This distinction matters when diagnosing and managing the allergy.

Common Egg Allergy Symptoms

Egg allergy symptoms can affect different parts of the body and range in severity. Reactions often occur within minutes to a few hours after eating eggs or foods containing eggs.

Skin Reactions

Skin symptoms are among the most common signs of an egg allergy. These include:

Hives (red, itchy welts)
Eczema flare-ups
Redness and swelling around the mouth or face

Gastrointestinal Symptoms

Digestive symptoms can occur, such as:

Nausea
Vomiting
Abdominal cramps
Diarrhoea

Respiratory Symptoms

Respiratory issues may include:

Runny nose or sneezing
Coughing or wheezing
Shortness of breath or difficulty breathing

Cardiovascular and Systemic Symptoms

More severe reactions can involve:

Dizziness
Lightheadedness
Fainting due to a drop in blood pressure

Severe Egg Allergy Reactions (Anaphylaxis)

Anaphylaxis is a life-threatening reaction that can occur in some people with egg allergy. It requires immediate medical attention.

Signs of Anaphylaxis

Call emergency services (000) immediately if you notice:

Swelling of the throat or tongue
Difficulty breathing or talking
A rapid or weak pulse
Pale or blue skin
Collapse or loss of consciousness

What To Do in an Emergency

Administer an epinephrine (adrenaline) injector (EpiPen) if available.
Call 000 for an ambulance.
Lay the person flat (unless they are having difficulty breathing – allow them to sit).
Stay with them until help arrives.
If symptoms do not improve, a second dose of adrenaline may be needed after 5–15 minutes.

How Egg Allergy Is Diagnosed

Diagnosis involves a combination of:

Medical history: Your doctor will ask about your symptoms and when they occur.
Physical examination: Checking for signs of allergy.
Skin prick testing: Small amounts of allergen applied to the skin to check for a reaction.
Blood tests (IgE): Measures levels of egg-specific antibodies.
Oral food challenge: Under medical supervision, small amounts of egg are given to observe any reaction.

Allergy Testing in Australia

In Australia, your GP can refer you to an allergist or immunologist for testing. Medicare rebates may apply for consultations and certain tests.

Who Gets Egg Allergy and Why?

Egg allergy is more common in children, especially those under five. Many children outgrow the allergy by adolescence. Adult-onset egg allergy is rare but can occur.

Is It Common in Adults?

While less common than in children, adults can develop egg allergy, particularly after sensitisation from exposure at work (e.g. food industry workers) or from medications containing egg proteins.

Family History and Genetic Factors

Having a family history of allergies, asthma, or eczema increases the risk of developing egg allergy.

Managing Egg Allergy in Daily Life

Management focuses on avoiding eggs and preventing accidental exposure.

Hidden Sources of Eggs in Food

Eggs can appear in unexpected foods, such as:

Mayonnaise
Pasta
Baked goods (cakes, muffins, biscuits)
Some salad dressings
Processed meats

Food Label Reading Tips (Australia)

In Australia, food labelling laws require that eggs be listed in the ingredients or as an allergen statement (e.g. “Contains: Egg”). Always read labels carefully, even on familiar products, as ingredients can change.

Cross-Contamination at Work or Cafés

Cross-contact can occur in shared kitchens or food service settings. Practise safe food handling techniques, such as using separate utensils and equipment for egg-free meals.

Treatment Options and Outlook

Mild reactions: Managed with oral antihistamines.
Severe reactions: Require adrenaline and emergency care.
Long-term: Have an allergy action plan and carry an EpiPen if prescribed.

When to Consult a Specialist

If you experience a suspected allergic reaction, recurrent symptoms, or are unsure about management, see an allergist or immunologist.

Living Well With an Egg Allergy

With preparation and awareness, people with egg allergy can live full, healthy lives.

Egg Substitutes for Cooking

Great alternatives include:

Commercial egg replacers (e.g. Orgran No Egg)
Chia or flaxseed mixed with water
Applesauce or mashed banana
Vinegar and baking soda for baking

Mental Health and Allergy Management

It is normal to feel anxious about eating out or accidental exposure. Consider joining support groups or seeking counselling to help cope with these challenges.