E0 ConsensusModerate confidencePEM unclearSystematic-ReviewPeer-reviewedReviewed
Chronic fatigue syndrome: From etiology and mechanism to diagnosis and treatment.
Xu, Qing, Zhao, Mengyu, Wang, Qin et al. · Journal of psychiatric research · 2026 · DOI
Quick Summary
This review article summarizes current knowledge about ME/CFS, a long-lasting illness characterized by extreme fatigue that rest doesn't improve, along with muscle pain, sore throat, and mood problems. The article examines what might cause ME/CFS, how doctors can better diagnose it, and what treatments may help. The authors note that ME/CFS cases are increasing worldwide, especially since COVID-19, and that current treatments have limited effectiveness.
Why It Matters
This comprehensive review is timely given the surge in ME/CFS cases following the COVID-19 pandemic and the increasing prevalence in younger populations. By synthesizing current understanding of mechanisms, diagnosis, and treatment, it provides a foundation for advancing future research and improving clinical care for a disease that severely impacts patients' quality of life and work capacity.
Observed Findings
- ME/CFS incidence is rising annually with increasing prevalence in younger populations
- Post-COVID-19, ME/CFS prevalence has significantly surged
- Patients experience extreme fatigue lasting over six months, accompanied by physical symptoms (sore throat, muscle/joint pain) and neuropsychiatric symptoms (anxiety, distress)
- Current treatments have limited success rates
- ME/CFS etiology remains uncertain despite extensive research efforts
Inferred Conclusions
- ME/CFS represents a significant and growing 21st-century health threat, particularly post-pandemic
- The unknown etiology of ME/CFS limits development of effective treatments
- Comprehensive multidisciplinary approaches integrating pathogenesis, diagnostic, and therapeutic knowledge are needed to advance understanding and clinical outcomes
- Future research should prioritize identifying biomarkers and mechanisms to enable better diagnosis and targeted treatments
Remaining Questions
- What is the underlying biological cause or causes of ME/CFS?
- Are there reliable biomarkers that can be used to diagnose ME/CFS or predict treatment response?
What This Study Does Not Prove
As a systematic review rather than a primary research study, this article does not prove any new causal mechanisms or test novel therapies. It synthesizes existing knowledge but cannot establish definitive cause-and-effect relationships for ME/CFS etiology. The review's conclusions are limited by the quality and heterogeneity of underlying published studies.
Tags
Symptom:Post-Exertional MalaiseCognitive DysfunctionUnrefreshing SleepPainFatigueSensory Sensitivity
Biomarker:CytokinesMetabolomicsGene ExpressionBlood Biomarker
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:PEM Not DefinedWeak Case Definition
Metadata
- DOI
- 10.1016/j.jpsychires.2026.02.026
- PMID
- 41707618
- Review status
- Editor reviewed
- Evidence level
- Higher-level evidence type — systematic reviews, meta-analyses, guidelines, or major syntheses (study type, not a quality guarantee)
- Last updated
- 12 April 2026
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 →
Contribute
Private, reviewed by a human. Not a public comment thread.