How are Helicobacter and fatigue related?

Helicobacter pylori (H. pylori) is a bacterium that colonizes the stomach lining and can cause chronic gastritis, peptic ulcers, and rarely gastric cancer. A direct link to fatigue is not firmly established, but plausible indirect mechanisms exist. H. pylori can lead to iron deficiency anemia by impairing iron absorption or causing occult blood loss. It may also contribute to vitamin B12 deficiency through atrophic gastritis. Both deficiencies commonly cause fatigue, weakness, and cognitive fog. Additionally, chronic inflammation from H. pylori may affect overall energy levels. Evidence is moderate: many studies show associations, but fatigue is not a classic symptom of H. pylori infection. If you have persistent fatigue along with digestive issues (bloating, epigastric pain), testing for H. pylori (stool antigen, breath test, or biopsy) may be reasonable. Eradication therapy often improves gastrointestinal symptoms but does not consistently resolve fatigue. Caveat: fatigue has many causes (sleep, stress, thyroid, other infections). A positive H. pylori result alone does not explain fatigue. Consumer lab tests (e.g., MyBody-X) can detect H. pylori, but clinical interpretation by a physician is essential.