Deale, A, Wessely, S · Journal of the Royal Society of Medicine · 2000 · DOI
This study looked at how often ME/CFS patients are incorrectly diagnosed with psychiatric conditions like depression. Researchers found that about two-thirds of patients who had been labeled with a psychiatric diagnosis actually didn't have one, while about one-third of patients without a psychiatric diagnosis did have a treatable mental health condition. The study shows that distinguishing between ME/CFS and psychiatric disorders can be difficult, and doctors need better tools and training to get the diagnosis right.
Many ME/CFS patients report being wrongly told their illness is 'all in their head.' This study provides evidence that misdiagnosis is common and works both ways—some patients are incorrectly labeled as psychiatric when they aren't, while others have genuine treatable psychiatric conditions that go unrecognized. Understanding these patterns helps validate patient experiences and advocates for better diagnostic practices.
This study does not prove that ME/CFS is purely biological or that psychiatric factors play no role in the condition. It also does not establish why misdiagnosis occurs—only that it does. The findings are limited to patients referred to a specialized fatigue clinic and may not apply to all ME/CFS populations or primary care settings.
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
Deale, A & Wessely, S (2000). Diagnosis of psychiatric disorder in clinical evaluation of chronic fatigue syndrome.. Journal of the Royal Society of Medicine. https://doi.org/10.1177/014107680009300608
BibTeX
@article{mecfsatlas-deale-2000-diagnosis-psychiatric,
author = {Deale, A and Wessely, S},
title = {Diagnosis of psychiatric disorder in clinical evaluation of chronic fatigue syndrome.},
journal = {Journal of the Royal Society of Medicine},
year = {2000},
doi = {10.1177/014107680009300608},
note = {PubMed: 10911826},
url = {https://www.mecfsatlas.com/evidence/deale-2000-diagnosis-psychiatric},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/deale-2000-diagnosis-psychiatric
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