Neuroaetiology of chronic fatigue syndrome: an overview.
Sanders, Patricia, Korf, Jakob · The world journal of biological psychiatry : the official journal of the World Federation of Societies of Biological Psychiatry · 2008 · DOI
Quick Summary
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.
Why It Matters
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.
Observed Findings
Viral infections are frequently associated with CFS onset, but viruses are not consistently detected in patient samples
HPA axis abnormalities are commonly observed in CFS patients, but causality remains unclear
Immune dysfunction findings lack consistent empirical support as a primary cause
Cognitive behavioral therapy is ineffective in many patients despite being the most commonly used treatment
Variable treatment responses suggest potential biological subgroups within the CFS population
Inferred Conclusions
ME/CFS is a legitimate medical disorder, not a primary psychiatric condition
No single etiological hypothesis adequately explains all cases of CFS, suggesting disease heterogeneity
Identification of CFS subtypes may enable more targeted and effective therapeutic interventions
Current research methodology may be obscuring distinct biological subgroups with different etiologies
Remaining Questions
What biological or clinical criteria could identify distinct ME/CFS subtypes?
Is the apparent HPA axis dysfunction in CFS a primary cause or a secondary consequence of the disease?
What This Study Does Not Prove
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.