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Celiac Disease-Associated Anaemia – Causes & Treatment

Celiac disease-associated anaemia is a form of blood deficiency caused by nutrient malabsorption due to gluten-induced intestinal damage. Iron, folate, and vitamin B12 deficiency are the most common underlying causes.

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Things worth knowing about "Celiac Disease-Associated Anaemia"

Celiac disease-associated anaemia is a form of blood deficiency caused by nutrient malabsorption due to gluten-induced intestinal damage. Iron, folate, and vitamin B12 deficiency are the most common underlying causes.

What Is Celiac Disease-Associated Anaemia?

Celiac disease-associated anaemia refers to a form of anaemia (low red blood cell count or haemoglobin) that develops as a direct consequence of celiac disease. Celiac disease is a chronic autoimmune condition in which the ingestion of gluten – a protein found in wheat, rye, and barley – triggers an inflammatory immune response that damages the lining of the small intestine. This damage impairs the absorption of essential nutrients, ultimately leading to anaemia.

Causes

The anaemia in celiac disease is primarily caused by malabsorption – the inability of the damaged small intestinal mucosa to absorb key nutrients. The most common deficiencies involved include:

Iron deficiency: Iron is absorbed mainly in the duodenum and proximal jejunum – the sections of the small intestine most severely affected in celiac disease. Iron deficiency anaemia is the most frequent type seen in celiac patients.
Folate (vitamin B9) deficiency: Folate is essential for red blood cell production. Its deficiency leads to megaloblastic anaemia, where red blood cells are abnormally large but fewer in number.
Vitamin B12 deficiency: Less common than iron or folate deficiency, but can occur when the ileum (the lower part of the small intestine) is involved.
Copper deficiency: Rarely, copper deficiency may also contribute to anaemia in celiac disease.
Anaemia of chronic disease: Ongoing intestinal inflammation can suppress bone marrow activity and red blood cell production through inflammatory signalling pathways.

Symptoms

Symptoms of celiac disease-associated anaemia overlap with those of general anaemia, and may be compounded by gastrointestinal complaints from the underlying condition:

Persistent fatigue and low energy levels
Pale skin and mucous membranes
Shortness of breath on exertion
Heart palpitations
Dizziness and difficulty concentrating
Headaches
Brittle nails and hair loss (particularly with iron deficiency)
Tingling or numbness in the hands and feet (particularly with vitamin B12 deficiency)

Notably, anaemia may sometimes be the first or only presenting sign of celiac disease, especially in patients without obvious gastrointestinal symptoms – a presentation known as silent or atypical celiac disease.

Diagnosis

Diagnosis of celiac disease-associated anaemia involves a combination of blood tests, serological markers, and intestinal biopsy:

Blood Tests

Full blood count (FBC): Measures haemoglobin, red blood cell count, mean corpuscular volume (MCV), and other indices to classify the type of anaemia.
Iron studies: Serum ferritin, serum iron, and transferrin saturation to assess iron stores.
Serum folate and vitamin B12 levels.
Celiac serology: Anti-tissue transglutaminase IgA (tTG-IgA), anti-endomysial antibodies (EMA), and total serum IgA to screen for celiac disease.

Endoscopy and Biopsy

An upper gastrointestinal endoscopy with duodenal biopsy is required to confirm the diagnosis of celiac disease. Typical histological findings include villous atrophy and crypt hyperplasia, graded using the Marsh classification.

Treatment

Treatment targets both the underlying celiac disease and the specific nutrient deficiencies causing the anaemia:

Gluten-Free Diet

The cornerstone of treatment is a strict, lifelong gluten-free diet. Eliminating gluten allows the intestinal mucosa to heal over time, restoring the ability to absorb nutrients adequately. For many patients, anaemia improves significantly within several months of dietary adherence.

Nutrient Supplementation

Iron: Oral iron supplements (e.g., ferrous sulfate) are commonly prescribed. In cases of severe malabsorption or intolerance to oral iron, intravenous iron infusions may be necessary.
Folate: Daily folic acid supplementation until levels are restored.
Vitamin B12: Intramuscular injections or high-dose oral supplements, depending on the degree of malabsorption.

Monitoring and Follow-Up

Regular blood tests are essential to monitor the response to treatment and confirm normalisation of haematological parameters. If anaemia persists despite a gluten-free diet, adherence to the diet should be assessed and further investigation for refractory celiac disease or alternative causes of anaemia should be considered.

References

Camaschella C. - Iron-Deficiency Anemia. New England Journal of Medicine, 2015; 372(19): 1832-1843.
Rubio-Tapia A, Hill ID, Kelly CP et al. - ACG Clinical Guidelines: Diagnosis and Management of Celiac Disease. American Journal of Gastroenterology, 2013; 108(5): 656-676.
World Gastroenterology Organisation (WGO) - Celiac Disease: Global Guidelines. WGO Practice Guidelines, 2017. Available at: https://www.worldgastroenterology.org

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