Avellaneda Fernández, Alfredo, Pérez Martín, Alvaro, Izquierdo Martínez, Maravillas et al. · BMC psychiatry · 2009 · DOI
ME/CFS is a serious condition marked by extreme exhaustion that lasts at least six months and doesn't improve with rest. The fatigue is so severe that it can force people to reduce their daily activities by half or more. Doctors don't yet have a single test to diagnose it, so they diagnose it by ruling out other illnesses. There is currently no cure, but treatment works best when doctors, mental health professionals, and social support services work together to help patients.
This guideline is important because it brings together both clinical expertise and patient voices to identify real-world care gaps in ME/CFS management. It highlights that the healthcare and social systems need rapid adaptation to meet the needs of severely affected patients, emphasizing the urgency of multidisciplinary approaches and systemic change.
This guideline does not establish causation for ME/CFS or identify definitive biomarkers for diagnosis. It does not compare the effectiveness of different treatment modalities or provide clinical trial data, and cannot prove which aetiological hypotheses are correct without additional research.
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
Avellaneda Fernández, Alfredo, Pérez Martín, Alvaro, Izquierdo Martínez, Maravillas, Arruti Bustillo, Mar, Barbado Hernández, Francisco Javier, de la Cruz Labrado, Javier, et al. (2009). Chronic fatigue syndrome: aetiology, diagnosis and treatment.. BMC psychiatry. https://doi.org/10.1186/1471-244X-9-S1-S1
BibTeX
@article{mecfsatlas-avellaneda-fernndez-2009-chronic-fatigue,
author = {Avellaneda Fernández, Alfredo and Pérez Martín, Alvaro and Izquierdo Martínez, Maravillas and Arruti Bustillo, Mar and Barbado Hernández, Francisco Javier and de la Cruz Labrado, Javier and Díaz-Delgado Peñas, Rafael and Gutiérrez Rivas, Eduardo and Palacín Delgado, Cecilia and Rivera Redondo, Javier and Ramón Giménez, José Ramón},
title = {Chronic fatigue syndrome: aetiology, diagnosis and treatment.},
journal = {BMC psychiatry},
year = {2009},
doi = {10.1186/1471-244X-9-S1-S1},
note = {PubMed: 19857242},
url = {https://www.mecfsatlas.com/evidence/avellaneda-fernndez-2009-chronic-fatigue},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/avellaneda-fernndez-2009-chronic-fatigue
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