Wessely, S, Chalder, T, Hirsch, S et al. · The American journal of psychiatry · 1996 · DOI
This study followed over 1,900 people in primary care and found that most individuals with ME/CFS also had a current mental health condition like depression or anxiety. The researchers discovered that people with chronic fatigue were much more likely to have psychiatric disorders (60-78%) compared to those without fatigue (19-31%). While the study suggests a strong link between psychiatric conditions and ME/CFS, it does not explain whether one causes the other.
This research highlights the high prevalence of comorbid psychiatric conditions in ME/CFS populations, which has important implications for clinical care, diagnosis, and understanding disease mechanisms. The findings underscore the need for integrated mental health screening and support in ME/CFS management, while also raising important questions about whether psychiatric symptoms represent a distinct feature of ME/CFS or a secondary consequence of chronic illness.
This study does not prove that psychiatric disorders cause ME/CFS or vice versa—it only demonstrates strong associations. The study cannot determine the directionality of the relationship or whether both conditions share common underlying biological mechanisms. The high psychiatric comorbidity might reflect the psychological stress of living with chronic illness rather than a primary causal link.
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
Wessely, S, Chalder, T, Hirsch, S, Wallace, P, & Wright, D (1996). Psychological symptoms, somatic symptoms, and psychiatric disorder in chronic fatigue and chronic fatigue syndrome: a prospective study in the primary care setting.. The American journal of psychiatry. https://doi.org/10.1176/ajp.153.8.1050
BibTeX
@article{mecfsatlas-wessely-1996-psychological-symptoms,
author = {Wessely, S and Chalder, T and Hirsch, S and Wallace, P and Wright, D},
title = {Psychological symptoms, somatic symptoms, and psychiatric disorder in chronic fatigue and chronic fatigue syndrome: a prospective study in the primary care setting.},
journal = {The American journal of psychiatry},
year = {1996},
doi = {10.1176/ajp.153.8.1050},
note = {PubMed: 8678174},
url = {https://www.mecfsatlas.com/evidence/wessely-1996-psychological-symptoms},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/wessely-1996-psychological-symptoms
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