An autoimmune reaction to gluten — not a wheat allergy and not “gluten intolerance”. Testing comes before a gluten-free diet — and before an IBS label is left to stand. Community experiences, not medical advice.
Coeliac disease is an autoimmune reaction to gluten. It is not a wheat allergy and it is not “gluten intolerance”. When someone who has it eats gluten (a protein in wheat, barley, and rye), the immune system damages the lining of the small bowel. That can impair absorption of nutrients. It is not a wellness trend, an intolerance quiz, or a reason to go gluten-free “just in case”.
NHS and NICE materials describe a wide symptom list: diarrhoea or constipation, pain, bloating, tiredness, weight loss, mouth ulcers, and — in some people — anaemia, bone problems, or few gut symptoms at all. Only testing can sort coeliac disease from IBS and from other bowel conditions.
NICE NG20 tells clinicians to offer serological testing to groups that include people with IBS symptoms. NICE CG61 already includes coeliac antibodies (EMA or tTG) in the blood tests used when diagnosing IBS. In practice that means: do not park someone on an IBS label, and do not start a gluten-free diet, until coeliac testing has been done properly.
NG20 is specific about how to test:
A home finger-prick kit is not a NICE pathway. A "positive HLA" is not a diagnosis. Starting a gluten-free diet from either of those steps can make later NHS testing unreliable.
NIDDK also says doctors typically diagnose coeliac disease with blood tests and small-bowel biopsies, and they do not recommend starting a gluten-free diet before those tests, because the diet can change the results.
NG20 says people with confirmed coeliac disease can choose to include gluten-free oats, and will be advised whether to continue depending on their immunological, clinical, or histological response. That is not the same as “oats are safe for everyone with coeliac disease”. Some people react; contamination with wheat is another issue. A dietitian in coeliac care is the right person to individualise this — not a wellness blog.
Coeliac care starts with a confirmed diagnosis. A gluten-free diet before proper testing can make NHS results unreliable.
Anecdotal themes:
UK sources on this page are NICE NG20, NICE CG61, NHS, Guts UK, Coeliac UK and BSG. NIDDK and ACG 2023 sit behind 'autoimmune, test on gluten, diet after confirmation'.
Coeliac disease: recognition, assessment and management. Test on gluten; do not start a gluten-free diet until a specialist confirms the diagnosis.
Visit ResourceIBS in adults: antibody testing for coeliac disease is part of the diagnostic bloods.
Visit ResourceNHS overview of symptoms, testing, and the gluten-free diet after diagnosis.
Visit ResourceCharity information using UK spelling and NHS-aligned advice.
Visit ResourceBritish Society of Gastroenterology guidance on coeliac disease in secondary care.
Visit ResourceThe National Institute of Diabetes and Digestive and Kidney Diseases describes coeliac disease as a chronic digestive and immune disorder triggered by gluten — a protein in wheat, barley, and rye — that damages the small intestine. It is different from gluten sensitivity and different from a wheat allergy.
Visit ResourceThe American College of Gastroenterology 2023 coeliac guideline defines coeliac disease as a lasting immune response to gluten in wheat, barley, and rye. Blood tests for coeliac-specific antibodies such as tissue transglutaminase help with the first screen, and a strict gluten-free diet with follow-up is the treatment once coeliac disease is confirmed.
Visit ResourceCommunity experiences, not medical advice. This page is for education only. It is not a diagnosis, treatment plan, or substitute for care from a qualified clinician. Always discuss tests, medicines, and diet changes with your GP or specialist.