Sanders, Patricia, Korf, Jakob · The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry · 2008 · DOI
This review examines several competing theories about what causes ME/CFS. The authors found that while viral infections, brain hormone imbalances, immune problems, and psychological factors are all proposed as causes, none has been definitively proven. The authors suggest that ME/CFS may not be one single disease, but rather several different conditions that produce similar symptoms, which could explain why treatments like cognitive behavioral therapy work for some patients but not others.
This review is important because it acknowledges ME/CFS as a legitimate medical disorder rather than a purely psychiatric condition, while highlighting that current single-cause theories are inadequate. The suggestion that ME/CFS comprises multiple biological subtypes could redirect research and treatment toward personalized approaches, potentially improving outcomes for patients who do not respond to conventional therapies.
This review does not prove which hypothesis is correct or identify specific biomarkers for ME/CFS. It does not establish causation for any proposed mechanism—only that evidence remains inconclusive. The authors present a critical analysis rather than new experimental data, so the conclusions reflect gaps in existing literature rather than definitive evidence.
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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