Xu, Huimin, Luo, Yingzhe, Wu, Xi · Comprehensive Physiology · 2026 · DOI
This review examines how ME/CFS may involve aging of the immune system that affects blood flow to the brain, causing cognitive problems like 'brain fog.' The researchers propose that this immune aging triggers chronic inflammation, reduces oxygen delivery to brain cells, and damages the protective barrier around the brain, leading to memory and thinking difficulties. The authors suggest that treatments targeting inflammation, improving blood vessel function, and modulating immune responses could help improve cognition in ME/CFS patients.
Understanding the mechanistic link between immune aging, vascular dysfunction, and cognitive impairment could explain why ME/CFS patients experience persistent brain fog and opens new therapeutic avenues beyond symptomatic treatment. This integrative framework may help clinicians recognize cognition changes as part of systemic dysregulation rather than purely neuropsychiatric, potentially improving diagnostic and treatment approaches. For researchers, the proposed immune-vascular-cognitive axis provides a testable hypothesis that connects multiple observed ME/CFS pathologies into a unified biological mechanism.
This is a mechanistic review and does not present original experimental evidence or clinical trial data proving that immunosenescence causes cognitive symptoms in ME/CFS patients. The proposed mechanisms are largely inferred from literature synthesis and have not yet been directly validated in ME/CFS cohorts with simultaneous measurement of immune markers, cerebral blood flow, and cognitive outcomes. The study does not establish causation or demonstrate that targeting these pathways will effectively restore cognition in clinical populations.
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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