Aoun Sebaiti, Mehdi, Oubaya, Nadia, Gounden, Yannick et al. · Diagnostics (Basel, Switzerland) · 2025 · DOI
This study compared thinking and memory problems in ME/CFS patients with those in multiple sclerosis (MS) patients, since both conditions can cause similar cognitive issues, fatigue, and pain. Researchers tested 40 people with ME/CFS and 40 with MS using standard memory and attention tests. They found that ME/CFS patients have a specific pattern of cognitive difficulties, particularly problems with consolidating (storing) new information in memory, which is distinct from MS.
This research provides evidence that ME/CFS has a distinct cognitive profile separate from other neurological conditions, which could lead to more accurate diagnosis and better-targeted treatments. Understanding that cognitive problems in ME/CFS are intrinsic to the disease rather than simply caused by fatigue or mood changes validates patients' experiences and directs future research toward the specific brain mechanisms involved.
This study does not establish the biological mechanisms causing these cognitive differences, nor does it prove that consolidation problems are caused by ME/CFS rather than associated with it. The cross-sectional design cannot determine whether these cognitive deficits develop when ME/CFS begins or how they change over time. The correlation findings do not rule out that unmeasured factors (such as sleep quality or post-exertional malaise patterns) might influence cognitive performance.
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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