Noor, Nazir, Urits, Ivan, Degueure, Arielle et al. · Anesthesiology and pain medicine · 2021 · DOI
This review summarizes what researchers currently understand about ME/CFS, a complex illness causing severe fatigue and other symptoms. The condition may involve problems with the immune system, stress response, or nervous system, and can be triggered by infections like Epstein-Barr virus, though not always. Diagnosis requires six months of fatigue plus four symptoms like memory problems, sore throat, or post-exertion malaise, and doctors must rule out other conditions first. Treatment options include therapy, medication, and newer approaches like electrical stimulation, though more research is needed to find the best approaches.
This comprehensive review consolidates current scientific understanding of ME/CFS, helping both patients and clinicians understand why diagnosis is challenging and why multiple treatment approaches exist. As ME/CFS remains poorly understood despite affecting millions, this summary of existing evidence is valuable for informing future research directions and validating patient experiences of a multisystem condition.
This review does not establish definitive causes or mechanisms of ME/CFS, as its conclusions are based on reviewing existing literature rather than generating new experimental data. It cannot prove which treatment approaches are most effective, as evidence quality and study rigor vary considerably across the literature reviewed. The association between potential triggers (like EBV) and ME/CFS development remains correlational rather than proven causal.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Noor, Nazir, Urits, Ivan, Degueure, Arielle, Rando, Lauren, Kata, Vijay, Cornett, Elyse M, et al. (2021). A Comprehensive Update of the Current Understanding of Chronic Fatigue Syndrome.. Anesthesiology and pain medicine. https://doi.org/10.5812/aapm.113629
BibTeX
@article{mecfsatlas-noor-2021-comprehensive-update,
author = {Noor, Nazir and Urits, Ivan and Degueure, Arielle and Rando, Lauren and Kata, Vijay and Cornett, Elyse M and Kaye, Alan D and Imani, Farnad and Narimani-Zamanabadi, Mahnaz and Varrassi, Giustino and Viswanath, Omar},
title = {A Comprehensive Update of the Current Understanding of Chronic Fatigue Syndrome.},
journal = {Anesthesiology and pain medicine},
year = {2021},
doi = {10.5812/aapm.113629},
note = {PubMed: 34540633},
url = {https://www.mecfsatlas.com/evidence/noor-2021-comprehensive-update},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/noor-2021-comprehensive-update
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