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What is coeliac disease? A plain-English guide for the UK

What coeliac disease is, common symptoms, how it is diagnosed in the UK, and why a strict lifelong gluten-free diet is the treatment, with NHS and NICE links.

Published Last reviewed 4 min read

If you, or someone you cook for, has just been told they might have coeliac disease, the amount of information out there can feel overwhelming. This guide sets out the basics in plain English, and every health point links to an official UK source so you can read more.

What coeliac disease is

The NHS describes coeliac disease as a condition where your immune system attacks your own tissues when you eat gluten. This damages the small intestine, so the body cannot properly take in nutrients.

Coeliac UK is clear that it is an autoimmune condition, not an allergy or a food intolerance. That distinction matters in practice. “A little bit” of gluten is not fine, and a gluten-free diet is a medical necessity, not a lifestyle choice.

What is gluten?

Gluten is a protein found in wheat, barley and rye (NHS). That means it turns up in obvious foods like bread, pasta, cakes, biscuits and most breakfast cereals, and also in less obvious ones like some sauces, gravies, ready meals and most beers.

Oats are a special case. They do not contain gluten, but they are often contaminated with other grains, and a small number of people with coeliac disease react to pure oats as well. We cover this in detail in our guide to oats and coeliac disease.

How common is it?

According to the NHS, coeliac disease affects at least 1 in every 100 people in the UK, and it can develop at any age. Coeliac UK estimates that only 36% of people with the condition are diagnosed.

The NHS notes that people with type 1 diabetes, autoimmune thyroid disease, Down’s syndrome or Turner syndrome have a higher risk. So do first-degree relatives (parents, brothers, sisters and children) of someone with coeliac disease.

Common symptoms

Symptoms vary a lot from person to person. The NHS lists gut symptoms such as:

  • diarrhoea
  • stomach aches
  • bloating and wind
  • indigestion
  • constipation

It also lists more general symptoms, including tiredness, unintentional weight loss, an itchy rash called dermatitis herpetiformis, and in some cases fertility problems or nerve problems. Children may not grow at the expected rate.

Some people have only mild symptoms, and some have none they notice. That is one reason the condition is often missed or mistaken for irritable bowel syndrome (IBS).

Who should be tested?

NICE guideline NG20 recommends that healthcare professionals offer coeliac disease blood tests to people with, among other things:

  • persistent unexplained abdominal or gut symptoms
  • prolonged tiredness or unexpected weight loss
  • severe or persistent mouth ulcers
  • unexplained iron, vitamin B12 or folate deficiency
  • type 1 diabetes or autoimmune thyroid disease (at diagnosis)
  • irritable bowel syndrome (in adults)
  • a first-degree relative with coeliac disease

If any of these apply to you, talk to your GP.

How diagnosis works in the UK

The NHS explains that diagnosis usually starts with a blood test for antibodies, arranged by your GP. If the result is positive, adults are usually referred to a gastroenterologist, who may confirm the diagnosis with a biopsy of the small intestine, taken during an endoscopy.

Keep eating gluten until you are tested

NICE advises eating some gluten in more than one meal every day for at least six weeks before testing, and not starting a gluten-free diet until a specialist confirms the diagnosis, even after a positive blood test (NICE NG20, 1.1.3–1.1.4). Cutting gluten out early can make the tests inaccurate. Our coeliac blood test and diagnosis guide explains each step, including the new no-biopsy route for some adults.

Treatment: a strict, lifelong gluten-free diet

There is no cure. The NHS says the treatment is to stop eating all sources of gluten for life. Symptoms should improve considerably within weeks, although the gut can take up to a few years to heal completely.

After diagnosis you should be referred to a dietitian. NICE recommends an annual review, which includes checking weight, height and symptoms and considering whether you need dietary support.

The good news is that many foods are naturally gluten-free. The NHS lists meat and fish (not breaded or battered), fruit and vegetables, potatoes, rice, most dairy products, and gluten-free flours such as rice, corn, soy and potato flour.

Why sticking to the diet matters

The NHS says complications mainly affect people who keep eating gluten or who have not been diagnosed. They can include weakened bones (osteoporosis), iron deficiency anaemia and vitamin B12 or folate deficiency anaemia. Less commonly, they include some types of cancer, such as bowel cancer.

Practical next steps

  1. Get support. Coeliac UK is the national charity. The NHS lists its helpline as 0333 332 2033.
  2. Learn to read labels. Start with our guide to UK allergen labels and “may contain” warnings.
  3. Make your kitchen safe. See avoiding cross-contamination at home.
  4. Check your prescription entitlement. See gluten-free food on prescription.
  5. Plan your meals. Our 7-day gluten-free meal plan is built on naturally gluten-free food.

Parent or carer? Read our guide to coeliac disease in children, covering signs, testing and support at school.

Frequently asked questions

Is coeliac disease an allergy?

No. Coeliac UK describes coeliac disease as a serious autoimmune condition, not an allergy or a food intolerance. The immune system reacts to gluten and damages the lining of the small intestine.

Should I stop eating gluten before I get tested?

No. NICE guidance says tests are only accurate if you are eating gluten during the diagnostic process. It advises eating some gluten in more than one meal every day for at least six weeks before testing, and not starting a gluten-free diet until a specialist has confirmed the diagnosis.

How common is coeliac disease in the UK?

The NHS says coeliac disease affects at least 1 in every 100 people in the UK. Coeliac UK estimates that only around 36% of people with the condition have been diagnosed.

Can coeliac disease be cured?

There is no cure. According to the NHS, the treatment is to cut out all sources of gluten for life, which should help control symptoms and prevent long-term complications.

Sources

  1. Coeliac disease: overview, treatment and diagnosis pages, NHS. Accessed 4 October 2026.
  2. Coeliac disease: recognition, assessment and management (NG20), NICE. Accessed 4 October 2026.
  3. About coeliac disease, Coeliac UK. Accessed 4 October 2026.