E2 ModerateModerate confidencePEM unclearCase-ControlPeer-reviewedReviewed
Central sensitisation in chronic fatigue syndrome and fibromyalgia; a case control study.
Bourke, Julius H, Wodehouse, Theresa, Clark, Lucy V et al. · Journal of psychosomatic research · 2021 · DOI
Quick Summary
This study tested whether ME/CFS and fibromyalgia involve a condition called 'central sensitisation,' where the nervous system becomes overly sensitive to pain signals. Researchers compared pain sensitivity in 19 ME/CFS patients, 19 fibromyalgia patients, and 20 healthy people using physical tests. They found that 84% of ME/CFS patients and 95% of fibromyalgia patients showed signs of central sensitisation, while none of the healthy controls did.
Why It Matters
This study provides objective biological evidence that ME/CFS and fibromyalgia may share a common underlying mechanism—central sensitisation—rather than being purely psychological conditions. Understanding this shared pathophysiology could help researchers develop targeted treatments and validate ME/CFS as a medical condition with measurable physiological changes.
Observed Findings
- 84% of ME/CFS cases and 95% of fibromyalgia cases met criteria for central sensitisation, compared to 0% of healthy controls
- Pressure pain thresholds were significantly lower in both CFS (median 222 kPa) and FM (median 189 kPa) cases versus controls (median 311 kPa)
- Fibromyalgia cases showed abnormal cold-induced pain thresholds (22.6°C vs 14.2°C in controls) and heat-induced pain thresholds (38.0°C vs 45.3°C in controls), whereas CFS cases did not differ on these thermal measures
- Central sensitisation was defined as the presence of both enhanced temporal summation and inefficient conditioned pain modulation
Inferred Conclusions
- Central sensitisation may represent a common endophenotype shared between ME/CFS and fibromyalgia despite their phenotypic differences
- The high prevalence of central sensitisation in both conditions suggests their pathophysiology may involve altered central nervous system pain processing
- The distinction between CFS and FM on thermal pain thresholds suggests they may involve partially overlapping but distinct neurobiological mechanisms
Remaining Questions
- Is central sensitisation a cause of ME/CFS and fibromyalgia, a consequence of these illnesses, or an epiphenomenon?
- What drives the development of central sensitisation in affected individuals—genetic factors, infection, trauma, or other triggers?
What This Study Does Not Prove
This study does not prove that central sensitisation causes ME/CFS or fibromyalgia—it only shows an association. It does not clarify whether central sensitisation develops as a result of the illness, precedes it, or is a consequence of symptom-related changes in behaviour or activity. The small sample size and recruitment from secondary care clinics may not represent all ME/CFS patients.
Tags
Symptom:PainFatigueSensory SensitivityTemperature Dysregulation
Biomarker:Neuroimaging
Method Flag:Small SampleStrong PhenotypingWeak Case Definition
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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