Baĭdina, T V, Akintseva, Iu V, Trushnikova, T N · Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova · 2014
This study looked at fatigue in 60 people with multiple sclerosis (MS) and compared them to 12 healthy people. Researchers measured fatigue using a standardized scale and checked levels of serotonin (a chemical messenger) in blood platelets. They found that nearly 58% of MS patients experienced severe fatigue, and these patients had lower serotonin levels that seemed connected to their MS symptoms.
Although this study focuses on MS rather than ME/CFS specifically, it provides evidence that low serotonin levels may be associated with chronic fatigue in neurological conditions. Understanding biological markers like serotonin in fatigue-related illnesses could help researchers identify shared mechanisms across different fatiguing conditions and develop targeted treatments.
This study does not prove that low serotonin *causes* fatigue—it only shows an association. The cross-sectional design cannot establish temporal relationships or determine whether serotonin changes are a cause or consequence of fatigue. Additionally, this MS population may have different fatigue biology than ME/CFS patients, so findings cannot be directly applied to ME/CFS without further research.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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