iron deficiency anaemia
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The most common extraintestinal presentation of celiac — and frequently the only clue that something is wrong in adults.
Iron-deficiency anemia (IDA) is the most frequent extraintestinal manifestation of celiac disease. It results from impaired iron absorption due to villous-atrophy in the duodenum — the primary site of iron uptake. In many adults, IDA is the presenting symptom that triggers a celiac workup, often years before GI symptoms become prominent.
Why the Duodenum Matters for Iron
Iron absorption is highly concentrated in the duodenum and upper jejunum. The specialized iron transport proteins that move dietary iron from the gut lumen into the bloodstream (DMT1, ferroportin) are expressed almost exclusively in the upper small intestinal epithelium. villous-atrophy destroys exactly this tissue, eliminating the absorption machinery before the body has a chance to use it.
Presentation
- Fatigue, weakness
- Pallor
- Shortness of breath on exertion
- Brittle nails, hair loss (in severe cases)
- Often no GI symptoms — IDA as the sole presentation of celiac is common in adults
Diagnostic Significance
Unexplained iron-deficiency anemia — particularly in pre-menopausal women where iron loss might be attributed to menstruation — is a NICE "recommended testing" indication for celiac disease. Adults with IDA that does not respond to iron supplementation should always be investigated for celiac, as iron supplementation will fail if ongoing malabsorption is not addressed.
Treatment
- gluten-free-diet — addresses the underlying cause; allows duodenal epithelium to recover and iron absorption to resume
- Iron supplementation — needed at diagnosis to replenish stores; often parenteral (IV) iron is required if oral absorption remains poor during early GFD
- Recovery of iron stores typically takes months after starting GFD, but persistent low ferritin or iron despite treatment should trigger reassessment of adherence, recovery pace, and competing causes
Related Concepts
malabsorption | villous-atrophy | small-intestine | gluten-free-diet | symptoms
Source Basis
Current synthesis incorporates raw/jcm-14-04848-v3.pdf (Micronutrient Deficiencies Associated with a Gluten-Free Diet in Patients with Celiac Disease and Non-Celiac Gluten or Wheat Sensitivity, 2025), which supports improvement in iron-related deficiency risk after a GFD without implying full normalization for every patient.