Tschudi-Madsen, Hedda, Rødevand, Linn N, Bøymo Kaarbø, Mette et al. · Scandinavian journal of pain · 2019 · DOI
This study looked at 33 patients with widespread pain to understand how different diagnostic labels (fibromyalgia, chronic fatigue syndrome, and bodily distress syndrome) overlap and apply to the same people. Researchers also tested whether a patient-created quality-of-life survey could capture things that standard questionnaires miss. They found that most patients had very low quality of life scores, and that the newer diagnostic criteria for fibromyalgia work better together than older versions.
This study clarifies the substantial diagnostic overlap between fibromyalgia, ME/CFS, and related conditions, supporting more unified terminology under ICD-11. The finding that patient-generated quality-of-life measures capture unique clinical information not detected by standard questionnaires has direct relevance for comprehensive assessment and treatment planning in ME/CFS and related complex symptom disorders.
This study does not establish causation or temporal relationships between conditions, only their co-occurrence in a specialized clinic population. The small sample size (n=33) and lack of control group limits generalizability beyond tertiary pain clinic settings. The cross-sectional design cannot determine whether diagnostic overlap reflects shared underlying mechanisms or simply similar symptom presentations.
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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