Evidence check: Helicobacter in the context of fatigue

The link between Helicobacter pylori and fatigue is not straightforward. H. pylori is a bacterium colonizing the stomach, associated with gastritis, peptic ulcers, and increased gastric cancer risk. Fatigue is a common complaint, but the evidence for a direct causal role of H. pylori is weak. Proposed mechanisms include chronic low-grade inflammation (e.g., elevated IL-6, CRP) that could contribute to fatigue, as well as micronutrient deficiencies (iron, vitamin B12) due to atrophic gastritis. However, these are not specific to H. pylori and occur only in a subset of infected individuals. Most carriers remain asymptomatic. Epidemiological studies show mixed results: some report higher fatigue prevalence in infected persons, others find no association. A 2020 meta-analysis found a modest but inconsistent link. Therefore, the evidence is best described as 'mixed' or 'human-moderate' at most. Clinically, H. pylori testing is not recommended for unexplained fatigue unless other gastrointestinal symptoms or risk factors are present. Treatment should follow established guidelines. For fatigue, a broader diagnostic workup is essential.