Byrne, Hollie, Josev, Elisha K, Knight, Sarah J et al. · Brain structure & function · 2023 · DOI
This study looked at the size of the hypothalamus (a small part of the brain that controls many body functions) in teenagers with ME/CFS compared to healthy teenagers. While the overall brain structure sizes were similar between the two groups, researchers found that in ME/CFS patients, certain areas of the hypothalamus were slightly larger when fatigue was more severe, and other areas grew larger with longer illness duration. This suggests the hypothalamus may play a role in ME/CFS, though more research is needed to understand what this means.
The hypothalamus regulates critical functions disrupted in ME/CFS, including sleep, temperature control, and hormonal balance. This study provides preliminary evidence that structural brain changes in the hypothalamus may be linked to ME/CFS symptoms, potentially opening new avenues for understanding disease mechanisms and identifying biomarkers specific to adolescent ME/CFS.
This study does not prove that hypothalamic changes cause ME/CFS or explain the disease's underlying mechanisms—correlations observed do not establish causation. The small sample size, cross-sectional design, and weak associations mean findings may not generalize to all ME/CFS patients and require replication before clinical application. The study cannot determine whether brain changes precede illness onset or develop as a consequence of prolonged illness.
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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