E0 ConsensusModerate confidencePEM not requiredReview-NarrativePeer-reviewedReviewed
In the mind or in the brain? Scientific evidence for central sensitisation in chronic fatigue syndrome.
Nijs, Jo, Meeus, Mira, Van Oosterwijck, Jessica et al. · European journal of clinical investigation · 2012 · DOI
Quick Summary
This review examined whether ME/CFS involves a nervous system that becomes overly sensitive to pain and other sensations. Researchers found that people with ME/CFS do show heightened responses to various types of stimuli—including touch, pressure, heat, and electrical stimulation—across multiple body areas. Importantly, this nervous system sensitivity tends to get worse, not better, after exercise or stress, suggesting a fundamental difference in how the central nervous system responds in ME/CFS.
Why It Matters
This review provides an integrated framework for understanding why ME/CFS patients experience widespread pain, sensory overload, and symptom exacerbation after physical exertion. Establishing central sensitisation as a biological mechanism—rather than a psychological one—validates patient experiences and may redirect treatment approaches toward nervous system dysfunction rather than deconditioning.
Observed Findings
- Generalised hyperalgesia demonstrated across multiple sensory modalities (electrical, mechanical, pressure, heat, and histamine stimulation) in ME/CFS populations.
- Hyperalgia affects multiple tissue types including skin, muscle tissue, and lungs.
- Exercise and noxious heat pain augment rather than decrease hyperalgesia in ME/CFS patients, contrasting with typical physiological responses.
- Endogenous pain inhibition mechanisms are not activated appropriately in response to exercise.
- Diffuse noxious inhibitory controls show delayed activation following noxious heat stimulation.
Inferred Conclusions
- Central sensitisation of the central nervous system is a characteristic feature of ME/CFS.
- The impaired or delayed activation of endogenous pain inhibition mechanisms contributes to the heightened and sustained pain sensitivity in ME/CFS.
- Central sensitisation in ME/CFS aligns with evidence of immune dysfunction, HPA axis dysregulation, and the presence of infectious triggers, suggesting a multi-system pathophysiology.
Remaining Questions
- Is central sensitisation a primary driver of ME/CFS or a secondary consequence of other pathological processes?
- What specific neurobiological mechanisms cause the delayed or impaired activation of endogenous pain inhibition in ME/CFS?
What This Study Does Not Prove
This review does not establish causation; it demonstrates correlation between central sensitisation and ME/CFS. It does not determine whether central sensitisation is a primary cause of ME/CFS, a secondary consequence of the illness, or one of several parallel mechanisms. The narrative design also means systematic quality appraisal of included studies is not reported.
Tags
Symptom:Post-Exertional MalaisePainFatigueSensory Sensitivity
Biomarker:Neuroimaging
Method Flag:Weak Case DefinitionPEM Not Defined
Metadata
- DOI
- 10.1111/j.1365-2362.2011.02575.x
- PMID
- 21793823
- Review status
- Editor reviewed
- Evidence level
- Higher-level evidence type — systematic reviews, meta-analyses, guidelines, or major syntheses (study type, not a quality guarantee)
- Last updated
- 12 April 2026
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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