Celiac Wire

Complications

What untreated coeliac disease does

The reason for the strictness is not the symptoms. It is what happens quietly over decades in people who are not strict.

Updated 2 min read 12 citations Evidence strength 4/5

Bone

Malabsorption of calcium and vitamin D, plus inflammatory signalling, produces reduced bone mineral density in a large proportion of newly diagnosed adults. A review of coeliac disease and bone covers the mechanisms and management [8]. The reassuring part: density improves substantially on a strict gluten-free diet, particularly in the first two years. The unreassuring part: many adults are never offered a DEXA scan at diagnosis despite guideline recommendations [3].

Anaemia and nutrient deficiency

The duodenum is where iron is absorbed and it is the part of the intestine coeliac disease damages most. Iron deficiency anaemia is therefore both a common presentation and a common ongoing problem. Clinical practice guidance on iron deficiency anaemia treats coeliac disease as a diagnosis to actively consider. Folate, B12, vitamin D and zinc deficiencies also occur.

Refractory disease

Refractory coeliac disease means persistent villous atrophy and symptoms despite a strict gluten-free diet for at least twelve months. A clinical practice update covers its management [7], and a further review addresses non-responsive and refractory disease more broadly [8].

The critical clinical point: most people who appear refractory are not. They are still being exposed, usually without knowing. That is why objective exposure testing matters before escalating to immunosuppression — see how much gluten is too much.

Malignancy

Enteropathy-associated T-cell lymphoma is the complication that frightens people, and it is genuinely associated with coeliac disease — particularly with untreated or refractory disease. It is also rare. Relative risk elevation is substantial; absolute risk remains low, and it declines with adherence. Systematic review has examined colonic neoplasia in coeliac disease specifically.

The honest framing: this is a reason to take the diet seriously, not a reason to live in fear. Adherence is the modifiable variable.

Follow-up you should be getting

Recommended follow-up in European guidance [1][3]
WhenWhat
At diagnosisDietitian referral, full blood count, iron, folate, B12, vitamin D, calcium, thyroid function, bone density in adults
3-6 monthsSymptom and adherence review, repeat serology
12 monthsRepeat serology and nutrient screen; consider repeat biopsy if not improving
Annually thereafterAdherence review, nutrient screen, growth in children

Systematic reviews have also examined physical activity in coeliac disease, and autoimmune conditions cluster — including in pregnancy outcomes.

Common questions

Will my bones recover?
Largely, on a strict diet, with the greatest improvement early. Adults diagnosed late may not fully normalise.
Am I likely to get lymphoma?
No. The relative risk is elevated but the absolute risk is low, and adherence reduces it.
My symptoms are gone — do I still need follow-up?
Yes. Symptoms and healing are poorly correlated, and nutrient deficiencies are silent.
What if I still have symptoms after a year?
The first step is checking for ongoing exposure, not assuming refractory disease [7].

References

Every citation below links to the original peer-reviewed record on PubMed or via DOI. Nothing here is a substitute for medical advice.

  1. European Society for the Study of Coeliac Disease 2025 Updated Guidelines on the Diagnosis and Management of Coeliac Disease in Adults. Part 1: Diagnostic Approach Al-Toma A, Zingone F, Branchi F, et al. · United European gastroenterology journal · 2025 · Clinical guideline DOIPubMed 40999951Full text
  2. ACG Clinical Guideline: Management of Irritable Bowel Syndrome Lacy BE, Pimentel M, Brenner DM, et al. · The American journal of gastroenterology · 2021 · Clinical guideline DOIPubMed 33315591
  3. European Society for the Study of Coeliac Disease (ESsCD) guideline for coeliac disease and other gluten-related disorders Al-Toma A, Volta U, Auricchio R, et al. · United European gastroenterology journal · 2019 · Clinical guideline DOIPubMed 31210940Full text
  4. ACG clinical guidelines: diagnosis and management of celiac disease Rubio-Tapia A, Hill ID, Kelly CP, et al. · The American journal of gastroenterology · 2013 · Clinical guideline DOIPubMed 23609613Full text
  5. A Randomized Trial of a Transglutaminase 2 Inhibitor for Celiac Disease Schuppan D, Mäki M, Lundin KEA, et al. · The New England journal of medicine · 2021 · Randomised controlled trial DOIPubMed 34192430
  6. AGA Clinical Practice Update on Evaluation and Management of Belching, Abdominal Bloating, and Distention: Expert Review Moshiree B, Drossman D, Shaukat A · Gastroenterology · 2023 · Review DOIPubMed 37452811
  7. AGA Clinical Practice Update on Management of Refractory Celiac Disease: Expert Review Green PHR, Paski S, Ko CW, et al. · Gastroenterology · 2022 · Review DOIPubMed 36137844
  8. Celiac disease and bone Kondapalli AV, Walker MD · Archives of endocrinology and metabolism · 2022 · Review DOIPubMed 36382765Full text
  9. Epidemiology of Non-Hodgkin's Lymphoma Thandra KC, Barsouk A, Saginala K, et al. · Medical sciences (Basel, Switzerland) · 2021 · Review DOIPubMed 33573146Full text
  10. Small and Large Intestine (I): Malabsorption of Nutrients Montoro-Huguet MA, Belloc B, Domínguez-Cajal M · Nutrients · 2021 · Review DOIPubMed 33920345Full text
  11. Medical Care of Adults With Down Syndrome: A Clinical Guideline Tsou AY, Bulova P, Capone G, et al. · JAMA · 2020 · Review DOIPubMed 33079159
  12. Celiac disease Rodrigo L · World journal of gastroenterology · 2006 · Review DOIPubMed 17075969Full text