Missailidis, Daniel, Annesley, Sarah J, Fisher, Paul R · Diagnostics (Basel, Switzerland) · 2019 · DOI
Quick Summary
ME/CFS is a complex condition affecting multiple body systems, and researchers are working to understand what causes it. This review shows that evidence points to problems in the immune system, nervous system, muscle function, metabolism, and gut health in ME/CFS patients. Because patients experience different symptoms and may develop the condition in different ways, finding reliable diagnostic tests remains a key challenge that researchers are actively pursuing.
Why It Matters
This comprehensive overview validates that ME/CFS has measurable biological abnormalities across multiple organ systems, counteracting the perception that the condition lacks a biomedical basis. Identifying this multi-system pathology is essential for developing diagnostic tests and targeted treatments, and understanding how different triggers might cause similar disease presentations could improve patient care and research design.
Observed Findings
Disturbances in immunological and inflammatory pathways are documented across ME/CFS populations
Autonomic and neurological dysfunction are consistently reported in research studies
Muscle and mitochondrial function abnormalities are present in affected individuals
Metabolic shifts have been identified in ME/CFS patients
Gut physiology and microbiota disturbances are observable in the condition
Inferred Conclusions
ME/CFS has a tangible biomedical basis involving multiple interconnected body systems rather than being psychologically-based
Different triggering events may initiate similar downstream pathological cascades, suggesting final common pathways despite heterogeneous presentations
Diagnostic biomarker discovery and patient stratification are essential next steps for understanding and treating ME/CFS
The condition likely involves a far-reaching homeostatic shift affecting the entire body's regulatory systems
Remaining Questions
Which specific biomarkers could reliably diagnose ME/CFS and distinguish it from other conditions?
What This Study Does Not Prove
As an editorial review rather than original research, this work does not present new experimental data or prove causality for any specific mechanism. It does not establish which pathological findings are primary drivers versus secondary consequences, nor does it demonstrate that a single unifying pathological process accounts for all ME/CFS cases. The variability in presentations across patients means that findings may not apply equally to all individuals with the condition.
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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