Rodríguez, María Angeles Bullones, Afari, Niloofar, Buchwald, Dedra S et al. · The Journal of urology · 2009 · DOI
This study examined whether several poorly understood chronic pain and fatigue conditions tend to occur together in the same patients. Researchers reviewed over 1,000 published studies and found strong evidence that conditions like chronic pelvic pain, bladder pain, fibromyalgia, ME/CFS, and irritable bowel syndrome frequently overlap—sometimes occurring together in up to 79% of patients. This suggests these conditions may share common underlying causes rather than being completely separate diseases.
ME/CFS patients often experience multiple overlapping chronic pain and fatigue syndromes simultaneously, yet these are typically studied and managed separately. This review provides evidence that these conditions cluster together and may share common biological mechanisms, supporting a more integrated research and clinical approach. For ME/CFS specifically, understanding comorbidity patterns could help identify shared pathophysiology and improve diagnostic and treatment strategies.
This systematic review does not establish causality or demonstrate that these conditions are actually the same disease—only that they frequently co-occur. The review also cannot identify the specific biological mechanisms responsible for the overlap, nor can it determine whether shared risk factors, common pathophysiology, or other factors explain the associations. The varying methodologies across included studies limit the precision of comorbidity estimates.
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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