Gallagher, Arlene M, Thomas, Janice M, Hamilton, William T et al. · Journal of the Royal Society of Medicine · 2004 · DOI
This study looked at how often fatigue and related diagnoses were recorded in UK doctor's offices between 1990 and 2001. While the overall number of fatigue diagnoses decreased, the number of people diagnosed with ME/CFS and fibromyalgia actually increased during this time. Interestingly, the number of people reporting fatigue symptoms stayed roughly the same, suggesting that doctors may have simply changed how they labeled and diagnosed these conditions rather than there being a real change in how many people were affected.
This study challenges assumptions about whether ME/CFS is becoming more common, suggesting instead that increased diagnosis rates reflect evolving clinical recognition and terminology rather than true increases in disease incidence. Understanding these diagnostic trends helps patients contextualize epidemiological claims and informs discussions with healthcare providers about why diagnosis patterns have shifted over time.
This study does not prove that ME/CFS is not a real condition or that patients' symptoms were not genuine. It also cannot determine whether improved recognition of ME/CFS in later years was appropriate or whether some diagnoses were accurate—only that diagnostic labeling changed while underlying symptom reporting remained stable. The study's reliance on documented diagnoses means it cannot account for undiagnosed cases.
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
Gallagher, Arlene M, Thomas, Janice M, Hamilton, William T, & White, Peter D (2004). Incidence of fatigue symptoms and diagnoses presenting in UK primary care from 1990 to 2001.. Journal of the Royal Society of Medicine. https://doi.org/10.1177/014107680409701204
BibTeX
@article{mecfsatlas-gallagher-2004-incidence-fatigue,
author = {Gallagher, Arlene M and Thomas, Janice M and Hamilton, William T and White, Peter D},
title = {Incidence of fatigue symptoms and diagnoses presenting in UK primary care from 1990 to 2001.},
journal = {Journal of the Royal Society of Medicine},
year = {2004},
doi = {10.1177/014107680409701204},
note = {PubMed: 15574853},
url = {https://www.mecfsatlas.com/evidence/gallagher-2004-incidence-fatigue},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/gallagher-2004-incidence-fatigue
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