E0 ConsensusPreliminaryPEM unclearReview-NarrativePeer-reviewedMachine draft
Fibromyalgia and other unexplained clinical conditions.
Aaron, L A, Buchwald, D · Current rheumatology reports · 2001 · DOI
Quick Summary
This review examined research comparing fibromyalgia with ME/CFS and other related conditions like irritable bowel syndrome and migraines. The researchers looked at studies that measured how bodies of people with these conditions worked differently, trying to understand what might cause them. The goal was to see whether these conditions share common underlying problems.
Why It Matters
For ME/CFS patients and researchers, this review is important because many people experience multiple overlapping conditions simultaneously. Understanding whether ME/CFS shares common physiological mechanisms with fibromyalgia and other conditions could help identify shared treatment targets and improve diagnostic clarity.
Observed Findings
- Multiple unexplained clinical conditions including ME/CFS, fibromyalgia, IBS, TMD, and headache disorders frequently occur together in individual patients.
- Comparative physiological studies directly examining these conditions side-by-side were limited as of 2001.
- Several of these conditions share similar characteristics suggesting possible overlapping pathogenic mechanisms.
- Many of these conditions remain incompletely understood in terms of underlying biological cause.
Inferred Conclusions
- Fibromyalgia and ME/CFS likely share common pathogenic pathways given their frequent coexistence and overlapping features.
- Direct comparative research studying physiological parameters across these conditions is needed to elucidate mechanisms.
- Future research should prioritize head-to-head physiological comparisons rather than studying conditions in isolation.
Remaining Questions
- What specific physiological mechanisms are shared among ME/CFS, fibromyalgia, and other comorbid conditions?
- Why do these conditions frequently occur together—is it due to common underlying biology, shared risk factors, or other mechanisms?
- Do different conditions have distinct pathogenic mechanisms or do they represent manifestations of a single underlying disorder?
What This Study Does Not Prove
This review does not establish causation between conditions or prove that they are variants of a single disease. It cannot definitively identify the underlying mechanisms causing these conditions—it only summarizes what limited comparative studies existed at the time, and the scarcity of such comparisons means firm conclusions about shared pathology cannot be drawn.
Tags
Symptom:PainFatigueSensory Sensitivity
Method Flag:Weak Case Definition
Metadata
- DOI
- 10.1007/s11926-001-0006-5
- PMID
- 11286667
- Review status
- Machine draft
- Evidence level
- Established evidence from major reviews, guidelines, or evidence maps
- Last updated
- 8 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 →
Spotted an error in this entry? Report it →