What is coeliac disease?
Coeliac disease is an autoimmune condition in which eating gluten, a protein in wheat, barley and rye, triggers the immune system to attack and flatten the lining of the small intestine. This impairs nutrient absorption and causes symptoms ranging from diarrhoea, bloating and weight loss to fatigue, anaemia, mouth ulcers and an itchy blistering rash. Some people have few gut symptoms at all.
Coeliac disease affects roughly one in a hundred people in the UK, can begin at any age, and runs in families; many cases remain undiagnosed for years. Diagnosis starts with a blood test for tissue transglutaminase (tTG) antibodies, usually followed by a gastroscopy with small-bowel biopsies to confirm the diagnosis. Crucially, you must keep eating gluten until testing is complete, or results can be falsely negative.
Common symptoms
- Diarrhoea, bloating and excess wind
- Abdominal pain and cramping
- Persistent fatigue
- Unintentional weight loss
- Iron or B12 deficiency anaemia
- Mouth ulcers
- An itchy, blistering rash (dermatitis herpetiformis)
How long will you wait?
After a positive blood test, NHS patients commonly wait two to four months or more for the confirmatory gastroscopy, with routine gastroenterology clinic waits at many trusts adding further time before treatment advice begins.
Privately, you can typically see a consultant within 3–7 days, with blood tests and a confirmatory gastroscopy usually completed within 1–2 weeks.
NHS England median referral-to-treatment wait: 12.4 weeks, with 2.5 million people waiting over 18 weeks (May 2026). Individual waits vary by trust and urgency.
Treatment options
- Strict gluten-free diet. Complete lifelong exclusion of gluten allows the bowel lining to heal and is the only effective treatment.
- Dietitian support. Specialist dietetic input helps with label-reading, cross-contamination and keeping the diet nutritionally balanced.
- Nutrient replacement. Iron, B12, folate, calcium and vitamin D are corrected where deficient, with bone health monitored.
- Annual review. Ongoing checks of symptoms, antibodies and general health confirm the diet is working and catch complications early.
What does private treatment cost?
As a guide, a private gastroscopy with biopsies typically costs around £1,500–£2,200 in the UK in 2026, with initial consultation and antibody blood tests typically adding around £300–£500.
Does health insurance cover coeliac disease?
Private medical insurance commonly covers the diagnostic pathway for coeliac disease, including consultations, antibody tests and the confirmatory gastroscopy, when symptoms first arise after your policy starts. Once confirmed, however, coeliac disease is a lifelong condition managed by diet, and insurers do not cover gluten-free food, routine dietetic follow-up or annual monitoring, which are classed as ongoing management of a chronic condition. Pre-existing symptoms are usually excluded initially.
Frequently asked questions
Why must I keep eating gluten before testing?
Both the antibody blood test and the biopsy detect the immune reaction gluten provokes. If you cut gluten out beforehand, the bowel begins healing, antibody levels fall, and tests can come back normal even though you have coeliac disease. Guidelines advise eating gluten in more than one meal daily for at least six weeks before testing. If you have already stopped, discuss a supervised gluten challenge.
Is coeliac disease the same as gluten intolerance?
No. Coeliac disease is an autoimmune condition causing measurable damage to the bowel lining, with long-term risks including osteoporosis and nutritional deficiency if untreated. Non-coeliac gluten sensitivity causes real symptoms but no immune damage, and some trouble attributed to gluten is actually caused by fermentable carbohydrates (FODMAPs) in wheat. Getting properly tested matters, because coeliac disease requires lifelong strictness and formal follow-up.
How quickly will I feel better on a gluten-free diet?
Many people notice improvement within a few weeks, with energy often returning before bowel symptoms fully settle. The intestinal lining typically takes six months to two years to heal completely, and antibody levels are rechecked to confirm progress. If symptoms persist, the usual culprit is inadvertent gluten from cross-contamination or hidden ingredients, which is where specialist dietitian input earns its keep.
Related guides
- Acid Reflux (GORD)
- Barrett's Oesophagus
- Crohn's Disease
- Diverticular Disease
- Irritable Bowel Syndrome (IBS)
- Ulcerative Colitis