Myths vs facts: Helicobacter and fatigue

The claim that Helicobacter pylori infection directly causes fatigue is a myth, but it has a kernel of truth. H. pylori is a bacterium that colonizes the gastric mucosa and can lead to gastritis, peptic ulcers, and increased gastric cancer risk. An indirect link to fatigue exists via two mechanisms: first, chronic infection can cause iron deficiency anemia by impairing iron absorption; second, atrophic gastritis may reduce intrinsic factor production, leading to vitamin B12 deficiency and subsequent fatigue, weakness, and neurological symptoms. However, these consequences are not universal; many infected individuals remain asymptomatic. The evidence for a causal relationship between H. pylori and fatigue is moderate, based on observational studies and case reports. Testing for H. pylori (breath test, stool antigen, or biopsy) is warranted for persistent gastrointestinal symptoms, but not as a standalone workup for fatigue. A MyBody-X stool test for H. pylori can provide a clue but does not replace clinical evaluation. Caveat: self-treatment with antibiotics is not recommended; eradication should follow guidelines.