Quick read
Key points
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Coeliac disease is an autoimmune condition in which eating gluten — a protein found in wheat, barley, and rye — triggers the immune system to damage the lining of the small intestine. This can lead to symptoms like diarrhoea, bloating, abdominal pain, fatigue, and, over time, nutrient deficiencies if untreated.
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Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
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You have persistent digestive symptoms, such as bloating, diarrhoea, or abdominal pain
01 · Know
What is Coeliac Disease?
Coeliac disease is an autoimmune condition in which eating gluten — a protein found in wheat, barley, and rye — triggers the immune system to damage the lining of the small intestine. This can lead to symptoms like diarrhoea, bloating, abdominal pain, fatigue, and, over time, nutrient deficiencies if untreated.
The only treatment is a strict, lifelong gluten-free diet, which allows the gut lining to heal and symptoms to resolve. It's important to get a proper diagnosis through blood tests and, usually, a biopsy before starting a gluten-free diet, since doing so beforehand can affect test accuracy.
02 · Understand
Clinical context
Keep eating gluten until testing is complete
Starting a gluten-free diet before diagnostic testing is complete can make coeliac disease harder to detect accurately — if you suspect coeliac disease, it's important to keep eating gluten until your doctor confirms testing is finished.
03 · Act
When to See a Doctor
- 1You have persistent digestive symptoms, such as bloating, diarrhoea, or abdominal pain
- 2You have unexplained fatigue, weight loss, or nutrient deficiencies, such as iron deficiency anaemia
- 3You have a family history of coeliac disease and want to discuss testing
- 4You've been diagnosed and have questions about managing a gluten-free diet
04 · Prevent & manage
Practical steps
Even Small Amounts of Gluten Can Cause Gut Damage
For people with coeliac disease, even small or occasional amounts of gluten can trigger gut damage, even without obvious symptoms — a strict, consistent gluten-free diet is necessary, not just avoiding gluten "most of the time."
- 1Get properly tested before changing your diet.Blood tests and, usually, a biopsy give an accurate diagnosis, but only if you're still eating gluten beforehand.
- 2Follow a strict, lifelong gluten-free diet once diagnosed.This is the only effective treatment and allows the gut to heal properly.
- 3Learn to read food labels carefully.Gluten can be present in unexpected products, so careful label-reading becomes an important skill.
- 4Watch for cross-contamination.Shared cooking surfaces, utensils, or toasters can introduce small amounts of gluten.
- 5Attend follow-up appointments and blood tests.These check that your gut is healing and that you're not experiencing nutrient deficiencies.
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Coeliac disease is well managed with a strict, lifelong gluten-free diet, which allows the gut to heal and symptoms to resolve.
Keep eating gluten until diagnostic testing is complete — starting a gluten-free diet early can make accurate diagnosis difficult.