Johnson, S K, DeLuca, J, Natelson, B H · Annals of behavioral medicine : a publication of the Society of Behavioral Medicine · 1999 · DOI
This review article examines what scientists have learned about ME/CFS by looking at many different studies. Researchers found that ME/CFS is complex—it likely involves multiple causes including viral infections, immune system problems, nervous system dysfunction, and possibly psychological factors. The article emphasizes that ME/CFS affects different people in different ways, suggesting that patients may benefit from being grouped by their symptoms and illness history rather than treated as one uniform condition.
This comprehensive review provides crucial context for understanding ME/CFS as a legitimate medical condition with biological underpinnings, moving beyond purely psychological interpretations. For patients, it validates that their illness involves real physiological changes in immune and nervous system function. For researchers, it identifies the heterogeneous nature of the condition and suggests that subgrouping strategies could improve future research design and treatment development.
This review does not establish causality for any single factor in ME/CFS—it synthesizes existing evidence which is often correlational. It does not provide new experimental data or resolve which factors are primary versus secondary consequences of illness. The 1999 publication date also means it does not reflect advances in biomarker research, viral persistence studies, or neuroimaging techniques developed in subsequent decades.
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
Johnson, S K, DeLuca, J, & Natelson, B H (1999). Chronic fatigue syndrome: reviewing the research findings.. Annals of behavioral medicine : a publication of the Society of Behavioral Medicine. https://doi.org/10.1007/BF02884843
BibTeX
@article{mecfsatlas-johnson-1999-chronic-fatigue,
author = {Johnson, S K and DeLuca, J and Natelson, B H},
title = {Chronic fatigue syndrome: reviewing the research findings.},
journal = {Annals of behavioral medicine : a publication of the Society of Behavioral Medicine},
year = {1999},
doi = {10.1007/BF02884843},
note = {PubMed: 10626034},
url = {https://www.mecfsatlas.com/evidence/johnson-1999-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/johnson-1999-chronic-fatigue
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