Wu, Kang, Wu, Ziyao, Feng, Sitong et al. · Brain research bulletin · 2026 · DOI
This study looked at brain structure in people with ME/CFS by scanning the white matter (the brain's communication highways) and comparing them to healthy people. Researchers found that people with ME/CFS had damage in specific bundles of brain fibers called the cingulum, which is involved in emotion and memory. The damage was found in particular sections of this bundle, and fixing this damage appeared linked to feeling less fatigued.
This is one of the largest neuroimaging studies of ME/CFS to date, providing structural evidence that the disease involves specific, measurable white matter damage rather than just functional changes. Identifying the cingulum bundle as a key site of pathology offers a potential biomarker for diagnosis and a target for understanding mechanisms and monitoring treatment response.
This study does not prove that white matter damage causes ME/CFS fatigue, only that they are associated. The treatment efficacy analysis suggesting causality is inferred retrospectively and does not establish a causal mechanism. Cross-sectional design means we cannot determine if the white matter changes develop before, during, or after symptom onset.
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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