Melidis, Christos, Denham, Susan L, Hyland, Michael E · Bio Systems · 2018 · DOI
This study looked at whether ME/CFS, fibromyalgia, and IBS might result from the body's biological systems becoming overly adapted in ways that backfire. Researchers surveyed 1,751 people with these conditions about their symptoms and used computer analysis to identify patterns. They found that as symptoms become more severe and widespread, the differences between these three conditions blur, suggesting they may share common underlying mechanisms.
This study offers a unifying biological framework for understanding ME/CFS alongside other functional disorders—suggesting they may represent degrees of severity within a common pathophysiological process rather than entirely separate diseases. If validated, this adaptive network model could guide research toward shared biological mechanisms and potentially lead to more targeted treatments.
This study cannot establish causation or identify what initially triggers the proposed network adaptation. It does not prove that psychological factors play no role, nor does it identify the specific biological mechanisms driving symptom generation. As a cross-sectional survey study, it cannot determine whether observed patterns reflect disease mechanisms, compensatory responses, or artifacts of symptom reporting.
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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