Armon, C, Kurland, L T · Reviews of infectious diseases · 1991 · DOI
This article examines how ME/CFS is diagnosed and points out problems with the current definition used by doctors. The authors identified several issues: the definition doesn't clearly address what happens when patients do too much activity, it doesn't specify how much rest is needed, and it may miss cases in poorer communities. They suggest a new flowchart that could help identify different types of ME/CFS and potentially help some patients avoid developing the condition.
Clear and accurate diagnostic criteria are fundamental to identifying ME/CFS patients and ensuring consistent research across studies. This paper highlighted critical weaknesses in how ME/CFS was being diagnosed in 1991, which directly affected which patients were included in research and how many people were thought to have the disease. Better definitions help researchers study more homogeneous patient groups and improve clinical recognition of the condition.
This study does not prove that any specific diagnostic approach is superior—it is a critical analysis of existing definitions rather than empirical research testing new criteria. It does not establish which proposed modifications would actually improve case identification or patient outcomes in practice. It cannot determine whether the identified biases significantly affected prevalence estimates or research conclusions without empirical validation.
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
Armon, C & Kurland, L T (1991). Chronic fatigue syndrome: issues in the diagnosis and estimation of incidence.. Reviews of infectious diseases. https://doi.org/10.1093/clinids/13.supplement_1.s68
BibTeX
@article{mecfsatlas-armon-1991-chronic-fatigue,
author = {Armon, C and Kurland, L T},
title = {Chronic fatigue syndrome: issues in the diagnosis and estimation of incidence.},
journal = {Reviews of infectious diseases},
year = {1991},
doi = {10.1093/clinids/13.supplement_1.s68},
note = {PubMed: 2020804},
url = {https://www.mecfsatlas.com/evidence/armon-1991-chronic-fatigue},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/armon-1991-chronic-fatigue
Contribute
Private, reviewed by a human. Not a public comment thread.