Saini, Urvi, Aggen, Steven H, Oldehinkel, Albertine J et al. · BMC psychiatry · 2026 · DOI
This study looked at how symptoms of depression, anxiety, ME/CFS, fibromyalgia, and irritable bowel syndrome overlap in over 100,000 people. Researchers found that these conditions share common symptoms like fatigue, sleep problems, and difficulty concentrating—which they call 'general malaise'—rather than being completely separate diseases. Understanding these shared symptoms may help explain why people often have multiple conditions at the same time.
This research provides evidence that ME/CFS shares a common symptom structure with other conditions rather than being entirely distinct, which could explain why ME/CFS patients often experience comorbid psychiatric and functional symptoms. Identifying the 'general malaise' dimension as central to multiple disorders offers a new framework for understanding and potentially treating the overlapping symptoms that burden ME/CFS patients. The finding that chronic stress associates with all symptom dimensions highlights a potential intervention target across conditions.
This cross-sectional study cannot establish causality—it shows which symptoms cluster together but not whether one condition causes another or what temporal relationships exist. The study relies on self-reported symptoms without confirmed clinical diagnoses, so results may not apply to formally diagnosed ME/CFS patients. The findings describe symptom patterns in the general population and do not prove that the identified dimensions operate identically in clinical populations with diagnosed disease.
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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