Coeliac vs gluten sensitivity

Coeliac disease is an autoimmune condition in which gluten triggers the immune system to damage the small intestine, confirmed through specific blood antibody tests and intestinal biopsy. Non-coeliac gluten sensitivity causes similar digestive symptoms after eating gluten, but without the autoimmune response or intestinal damage seen in coeliac disease, and there is currently no specific diagnostic test for it. Both can cause genuinely uncomfortable symptoms, but they are distinct conditions with different underlying mechanisms and testing requirements.

Coeliac disease is diagnosed through specific blood tests for antibodies (such as anti-tTG) and confirmed with a small intestine biopsy showing characteristic damage, both of which need to be done while still eating gluten. Non-coeliac gluten sensitivity has no specific blood test or biopsy finding; it is generally diagnosed by first excluding coeliac disease and wheat allergy through proper testing, then observing whether symptoms improve on a gluten-free diet and return when gluten is reintroduced. This distinction matters because the underlying processes, long-term implications, and diagnostic approach differ considerably.

Coeliac disease requires strict, lifelong gluten avoidance because ongoing exposure causes progressive gut damage and nutritional deficiencies, even without obvious symptoms, and needs regular medical monitoring. Non-coeliac gluten sensitivity, while still requiring gluten avoidance for symptom control, does not cause the same intestinal damage or carry the same long-term health risks if gluten is occasionally consumed. This is why accurate diagnosis matters significantly for guiding the appropriate level of dietary strictness and medical monitoring needed.

It's important that coeliac disease is properly excluded through appropriate testing before concluding that gluten sensitivity is the cause of symptoms, and other conditions such as irritable bowel syndrome or wheat allergy can also cause similar symptoms and need to be considered. A thorough medical assessment helps distinguish between these possibilities rather than relying on symptoms and self-diagnosis alone. Getting the right diagnosis ensures the most appropriate and effective long-term management.

It's generally recommended to complete testing for coeliac disease before starting a gluten-free diet, since doing so beforehand can mask the results of subsequent testing and lead to a missed coeliac diagnosis, with important implications for long-term gut health monitoring that would otherwise be missed. If you've already started a gluten-free diet and want to be tested, your doctor may recommend a supervised gluten reintroduction period before testing for accurate results. This is an important sequencing consideration to discuss with your doctor before making dietary changes.

See a doctor before making significant dietary changes if you suspect gluten is causing symptoms, so that coeliac disease and other conditions can be properly tested for and excluded first. NHS gastroenterology referral can take several weeks; a private consultation is typically available within about 2 weeks for earlier, thorough assessment and testing.