Can persistent H. pylori infection contribute to iron deficiency?

Persistent Helicobacter pylori infection is a biologically credible and clinically relevant contributor to iron deficiency, particularly when iron stores fail to replete as expected with oral iron. Its role is not uniform across all infected people, and it should be considered alongside other common causes of deficiency.

Clinical evidence

• Observational evidence associates active H. pylori infection with iron deficiency and iron-deficiency anemia; infected dyspeptic patients have shown lower ferritin and transferrin saturation than uninfected participants.
• In an 86-patient study, adding eradication treatment to oral iron produced greater increases in ferritin and serum iron than oral iron alone.
• Trial syntheses are mixed: a 16-trial meta-analysis reported improvements in hemoglobin, serum iron, and ferritin with eradication plus iron, whereas a later seven-trial analysis found improved ferritin but no statistically significant hemoglobin benefit, with substantial heterogeneity and possible publication bias.

Mechanisms

• H. pylori reliably causes gastritis and can raise intragastric pH, especially with corpus-predominant or atrophic disease. Reduced gastric acid and gastric-juice ascorbate can decrease non-heme iron solubility and ferric-to-ferrous reduction before proximal intestinal uptake.
• In a human study of H. pylori gastritis with unexplained iron-deficiency anemia, median intragastric pH was higher and gastric ascorbic acid lower than in healthy controls.
• The organism also has high-affinity iron-acquisition systems that access host iron proteins. This likely contributes to host iron depletion, although direct proof that it reduces dietary intestinal iron absorption is limited.

Clinical implications

• Evaluate persistent or recurrent iron deficiency for alternative or coexisting causes, including menstrual or gastrointestinal blood loss, dietary insufficiency, celiac disease, inflammation, and other malabsorptive disorders.
• Bottom line: H. pylori can plausibly impair iron handling and contribute to incomplete iron-store repletion on oral iron; eradication may improve ferritin recovery and should complement—not replace—iron treatment and a full cause-directed evaluation.