When iron supplements fail to correct a child’s anemia, the root cause may not be dietary deficiency at all — it may be celiac disease. A new study found that nearly 1 in 4 children with anemia that stubbornly resists iron treatment had undiagnosed celiac disease, and most of them showed no classic digestive symptoms whatsoever.
Published in the Sudanese Journal of Paediatrics, the research adds weight to a question that haunts families who’ve spent months chasing an anemia diagnosis with no answers. The children in this study weren’t presenting with diarrhea or obvious stomach trouble. They were pale, fatigued, and falling behind on growth — and their anemia kept returning no matter how much iron they received.
What This Means for You
If your child has been diagnosed with iron deficiency anemia and iron supplements haven’t worked, this study is a reason to ask your pediatrician specifically about celiac screening. The anemia in these children wasn’t just stubbornly low iron — it was a symptom of a damaged gut that couldn’t absorb iron in the first place. Adding more iron doesn’t solve that problem. Removing gluten does.
What makes this study particularly important for celiac families is that two-thirds of the children with celiac-linked anemia had no classic gastrointestinal symptoms. No chronic diarrhea. No swollen belly. No obvious gut distress. Their celiac disease was effectively invisible — detectable only through persistent anemia that wouldn’t respond to treatment. This is the same diagnostic gap we tracked in our earlier coverage of nutritional status in pediatric celiac disease at diagnosis and follow-up, where nutritional deficiencies frequently appeared before gut symptoms — or instead of them entirely.
The growth data in this study is striking. Children with celiac-linked anemia were dramatically more likely to show signs of malnutrition than children with unexplained anemia. Stunting (shorter than expected for age) appeared in 93% of the celiac group versus 44% of the comparison group. Poor weight-for-height ratios followed the same pattern: 93% versus 40%. These children weren’t just anemic — their entire nutritional absorption had been compromised, likely for a long time.
For families like mine, this is a reminder that celiac disease can wear many masks. The child who just can’t seem to hold onto iron is signaling something worth investigating.
Key Takeaways
- Nearly 1 in 4 children (23%) with treatment-resistant iron deficiency anemia were found to have celiac disease in this study.
- Most of these children had no stomach symptoms — their celiac was hidden behind persistent anemia alone.
- Children with celiac-related anemia showed dramatically higher rates of stunting and poor weight gain than children with unexplained anemia.
- If a child’s iron deficiency anemia doesn’t respond to iron supplements, celiac disease screening (a blood test) is warranted.
- A standard celiac blood test reliably flagged affected children in this study, supporting its use as a first-line screen before more invasive testing.
The Science
Want to understand how this actually works? We’ll walk you through the technical details below and define every term. No medical degree required.
What Is Refractory Iron Deficiency Anemia?
Refractory iron deficiency anemia (RIDA) is iron deficiency anemia that persists despite adequate iron supplementation. Standard iron deficiency anemia is common in children and usually responds to oral iron within weeks. When it doesn’t, clinicians look for an underlying cause — typically something blocking absorption or causing ongoing blood loss.
The researchers enrolled 65 children aged 6 months to 14 years who all met the RIDA criteria at a tertiary care hospital in North India. Children with positive celiac serology (see below) then underwent upper gastrointestinal endoscopy — a camera procedure to view the stomach and upper small intestine — and histopathological examination, meaning tissue samples were taken and analyzed under a microscope to look for intestinal damage.
Why Celiac Disease Causes Iron Deficiency
Dietary iron is absorbed primarily in the duodenum and upper jejunum — the first two sections of the small intestine. In celiac disease, an immune reaction to gliadin (a protein component of gluten) triggers villous atrophy: the destruction of the tiny finger-like projections (villi) that line the intestinal wall. These villi are responsible for most nutrient absorption. When they’re flattened by inflammation, the intestine loses its capacity to absorb iron — along with other nutrients. The result is malabsorption.
This is why iron supplements don’t work. The gut simply can’t absorb them. The only effective fix is eliminating gluten from the diet, which allows the intestinal lining to heal over time.
The Blood Test Finding
The study measured anti-tissue transglutaminase (anti-tTG) antibodies — proteins the immune system produces when reacting to gluten. This is the standard blood test for celiac disease screening. The difference in anti-tTG levels between children with celiac disease and those without was highly statistically significant (p < 0.001), meaning it’s extremely unlikely this result occurred by chance.
This finding has real clinical value. It confirms that standard serology can identify celiac disease even when the child’s presentation is atypical — anemia rather than gut symptoms. The blood test performs whether or not the gut complaints are obvious.
When the Endoscopy Looked Normal
Of the 23 children who tested positive on serology and underwent endoscopy, 15 (65%) showed abnormal findings consistent with celiac disease. The remaining 8 (35%) had a normal-appearing upper GI endoscopy.
That 35% figure deserves attention. A normal-looking endoscopy in a child with positive serology may point to ultra-short celiac disease — a form in which intestinal damage is confined to the very tip of the small intestine (the duodenal bulb) and is missed unless biopsies are taken from that specific location. We covered this diagnostic gap in depth in our earlier piece on ultra-short celiac disease and the risk of misdiagnosis without bulb biopsy. The bottom line: a normal-looking scope does not rule out celiac, particularly in children with confirmed positive blood tests.
Reading the Growth Data
The stunting and wasting numbers in this study carry clinical significance beyond the anemia itself. Stunting (height-for-age below the 3rd percentile) was present in 93.3% of children with celiac-related RIDA, compared to 44% of those with unexplained anemia. Wasting (low weight-for-height) followed the same distribution: 93.3% versus 40%. Both are markers of chronic, sustained malnutrition across multiple nutrients.
A child presenting with growth failure alongside treatment-resistant anemia should trigger celiac evaluation promptly. These findings don’t arise from a single missed dose of iron — they represent months or years of systemic malabsorption.
Related Coverage
- Nutritional status in pediatric celiac disease: evaluation at diagnosis and during follow-up
- High prevalence of ultra-short celiac disease in children with low anti-tissue transglutaminase immunoglobulin A levels: The risk of misdiagnosis without bulb biopsy
- Prevalence and predictors of coeliac disease in patients with irritable bowel syndrome: A prospective study from Rajasthan, India
References
Singh SC, Verma SK, Verma M, et al. Celiac disease in children with refractory iron deficiency anemia: a prospective observational study. Sudan J Paediatr. 2026;26(1):52–61. doi: 10.24911/SJP.106-1777780907. PubMed