E3 PreliminaryPreliminaryPEM unclearReview-NarrativePeer-reviewedReviewed
Central sensitization: a biopsychosocial explanation for chronic widespread pain in patients with fibromyalgia and chronic fatigue syndrome.
Meeus, Mira, Nijs, Jo · Clinical rheumatology · 2007 · DOI
Quick Summary
Many people with ME/CFS experience widespread pain in addition to fatigue, similar to fibromyalgia. This paper proposes that both conditions may be caused by 'central sensitization'—a problem where the nervous system becomes overly sensitive to pain signals. The authors review evidence suggesting this mechanism could explain ME/CFS pain, though more research is needed to confirm it.
Why It Matters
This paper bridges understanding between two overlapping conditions and proposes a unifying biological mechanism for the widespread pain that debilitates many ME/CFS patients. If central sensitization is confirmed in ME/CFS, it could open new avenues for targeted pain management and validate pain complaints as biologically rooted rather than primarily psychological.
Observed Findings
- Hyperalgesia and allodynia are documented in CFS patient populations
- Elevated blood nitric oxide concentrations have been reported in CFS patients
- Brain imaging abnormalities are observed in CFS populations
- Chronic widespread pain shows substantial overlap between CFS and fibromyalgia
- Certain personality styles associated with pain sensitization appear in CFS
Inferred Conclusions
- Central sensitization may be a shared pathophysiological mechanism explaining chronic widespread pain in both fibromyalgia and ME/CFS
- The neurochemical, neuroimaging, and clinical evidence in ME/CFS is consistent with a central sensitization model
- Similar research methodologies used to study pain in FM should be applied to test this hypothesis in CFS populations
Remaining Questions
- Does central sensitization actually cause ME/CFS pain, or is it a secondary consequence of the illness?
- How do temporal and spatial summation of pain signals function in ME/CFS patients compared to healthy controls and FM patients?
- What is the relative contribution of biological factors (nitric oxide, neuroinflammation) versus psychosocial factors to pain sensitization in ME/CFS?
What This Study Does Not Prove
This is a hypothesis paper based on a literature review, not an original empirical study; it does not present new experimental data proving central sensitization causes ME/CFS pain. The authors themselves note that direct evidence for this mechanism in CFS is currently lacking and call for further research. The proposed connection remains theoretical and requires validation through quantitative sensory testing and neurobiological studies.
Tags
Symptom:PainFatigueSensory Sensitivity
Biomarker:NeuroimagingBlood Biomarker
Method Flag:PEM Not DefinedExploratory OnlyWeak Case Definition
Metadata
- DOI
- 10.1007/s10067-006-0433-9
- PMID
- 17115100
- Review status
- Editor reviewed
- Evidence level
- Early hypothesis, preprint, editorial, or weak support
- 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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