Coeliac disease is often confused with a food allergy or gluten intolerance, but it is actually a different condition altogether.
Coeliac disease is an autoimmune condition, which means the body’s immune system mistakenly attacks its own healthy tissues. In people with coeliac disease, eating gluten triggers the immune system to damage the lining of the small intestine. Over time, this can affect the body’s ability to absorb nutrients properly and may lead to a wide range of symptoms and health problems.
Understanding what coeliac disease is – and what it is not – can help people get the right diagnosis, treatment, and support.
Quick Things to Know
- Coeliac disease is not a food allergy.
- It is an autoimmune condition triggered by eating gluten.
- Gluten is found in wheat, barley and rye.
- Symptoms can vary widely and may affect both children and adults.
- The only current treatment is a strict lifelong gluten-free diet.
- If you think you may have coeliac disease, speak to a healthcare professional before making significant dietary changes, as this may affect the accuracy of some diagnostic tests.
What Is Coeliac Disease?
Coeliac disease occurs when the immune system reacts abnormally to gluten, causing inflammation and damage to the lining of the small intestine.
Over time, this damage can reduce the body’s ability to absorb nutrients from food, leading to a range of symptoms and potential long-term health problems if left untreated.
Although many people associate coeliac disease with digestive issues, it can affect many different parts of the body.
Is Coeliac Disease an Allergy?
No.
Coeliac disease is not a food allergy and it is not the same as gluten intolerance or sensitivity.
A food allergy involves the immune system reacting to a food protein and may cause symptoms such as hives, swelling or anaphylaxis.
Coeliac disease is an autoimmune condition where gluten triggers the immune system to damage the small intestine.
The treatment for both may involve avoiding certain foods, but the underlying conditions are very different.
What Is Gluten?
Gluten is a group of proteins naturally found in cereals including:
- Wheat
- Barley
- Rye
It is commonly present in foods such as:
- Bread
- Pasta
- Cakes
- Biscuits
- Pastries
- Breakfast cereals
- Beer
- Some sauces and processed foods
Many naturally gluten-free foods are available, but it is always important to check labels carefully.
What Does “Gluten-Free” Mean?
In the UK and many other countries, foods labelled “gluten-free” must meet strict legal standards based on the internationally recognised Codex Alimentarius guidelines. In simple terms, this means the food must contain 20 parts per million (ppm) of gluten or less.
For people with coeliac disease, products meeting this standard are generally considered suitable as part of a gluten-free diet.
However, it is important to remember that coeliac disease and food allergies are different conditions. Someone with a wheat allergy, for example, may still need to avoid certain products labelled “gluten-free” depending on their individual allergy and the ingredients used.
Always read ingredient labels carefully and follow advice from your healthcare professional or allergy specialist if you are unsure whether a product is suitable for your circumstances.
Common Symptoms
Symptoms vary from person to person and can develop at any age.
Digestive symptoms may include:
- Ongoing diarrhoea
- Constipation
- Bloating
- Stomach pain
- Excessive wind
- Nausea
- Unexplained weight loss
Some people experience symptoms outside the digestive system, including:
- Fatigue
- Iron deficiency anaemia
- Mouth ulcers
- Headaches
- Joint pain
- Poor growth in children
- Delayed puberty
- Fertility problems
- Skin conditions such as dermatitis herpetiformis
Some people have very few symptoms despite significant intestinal damage.
Who Can Develop Coeliac Disease?
Coeliac disease can develop in both children and adults.
You may have a higher chance of developing it if you have:
- A close family member with coeliac disease
- Type 1 diabetes
- Autoimmune thyroid disease
- Down syndrome
- Turner syndrome
- Other autoimmune conditions
Having these risk factors does not mean you will definitely develop coeliac disease, but they may increase the likelihood.
How Is It Diagnosed?
If a doctor suspects coeliac disease, they may arrange:
- Blood tests looking for specific antibodies.
- Referral for further investigations if needed.
- An endoscopy with a small bowel biopsy in some cases to confirm the diagnosis.
A Note Before Changing Your Diet
If you think you may have coeliac disease, it is usually best to speak to a healthcare professional before making significant dietary changes.
Removing gluten before medical testing can affect the accuracy of some blood tests and other investigations, potentially making diagnosis more difficult.
How Is It Treated?
There is currently no cure for coeliac disease.
The only effective treatment is a strict lifelong gluten-free diet.
This means avoiding foods containing wheat, barley and rye while choosing suitable gluten-free alternatives.
Following the diet carefully allows the small intestine to heal and helps reduce the risk of long-term complications.
Living with Coeliac Disease
Many people live healthy, active lives after diagnosis.
Helpful steps include:
- Learning to read food labels carefully.
- Planning ahead when eating out.
- Talking to Others About Allergies: How to Explain Your Needs Clearly
- Watching for cross-contamination when preparing food.
Support groups and charities can also provide practical advice and reassurance.
Coeliac Disease vs Wheat Allergy
Although both conditions may involve avoiding wheat-containing foods, they are very different.
| Coeliac Disease | Wheat Allergy |
|---|---|
| Autoimmune condition | Food allergy |
| Triggered by gluten | Triggered by proteins in wheat |
| Damages the small intestine | Can cause allergic reactions, including anaphylaxis |
| Diagnosed through medical investigations | Diagnosed through allergy assessment |
| Managed with a strict gluten-free diet | Managed by avoiding wheat and following allergy advice |
When Should You Speak to a Doctor?
Consider seeking medical advice if you or your child experiences:
- Persistent digestive symptoms.
- Unexplained weight loss.
- Ongoing tiredness.
- Recurrent mouth ulcers.
- Poor growth in children.
- Iron deficiency anaemia without an obvious cause.
- Symptoms that improve when gluten is removed but return when it is eaten again.
A healthcare professional can assess your symptoms and advise whether further investigation is appropriate.
Final Thoughts
Coeliac disease is a serious autoimmune condition that affects thousands of people across the UK.
Although it is often confused with food allergies or gluten intolerance, it requires its own approach to diagnosis and management. With the right support and a strict gluten-free diet, most people are able to manage the condition successfully and live full, healthy lives.
If you think you or your child may have coeliac disease, seeking medical advice can help ensure the most appropriate investigations and support are available.
Related Guides
- Wheat Allergy Explained
- Food Allergy vs Food Intolerance
- Understanding Food Labels
- Eating Out with Food Allergies
- Preparing for an Allergy Appointment
Disclaimer
This guide is for general educational and informational purposes only and should not replace professional medical advice, diagnosis or treatment.
If you think you or your child may have coeliac disease or another medical condition, seek advice from a qualified healthcare professional. If significant dietary changes are being considered because of suspected coeliac disease, discussing this with your healthcare team first may help ensure any recommended investigations can be carried out as effectively as possible.