Yoo, Eun Hae, Choi, Eun Sil, Cho, Soo Hyun et al. · Korean journal of family medicine · 2018 · DOI
This study compared fatigue and quality of life in 200 Korean adults with fatigue. Researchers divided participants into two groups: those whose fatigue had a clear medical explanation (like anemia or thyroid disease) and those whose fatigue remained unexplained after testing. People with unexplained fatigue reported significantly lower quality of life, especially in physical functioning, compared to those with explained fatigue.
This study directly addresses a critical gap in recognition of unexplained fatigue as a legitimate health condition affecting quality of life. For ME/CFS patients and researchers, it demonstrates that fatigue without identified laboratory abnormalities causes substantial functional disability and warrants clinical attention, potentially supporting arguments for better diagnosis and treatment protocols for conditions like ME/CFS.
This study does not prove that unexplained fatigue causes poor quality of life—it only shows they occur together (correlation, not causation). It also does not establish the underlying mechanisms of unexplained fatigue or distinguish between different causes of unexplained fatigue (such as ME/CFS, post-viral fatigue, or other conditions). The cross-sectional design cannot determine whether poor QoL develops after fatigue onset or whether pre-existing QoL issues contribute to fatigue 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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