Jason, L A, Torres-Harding, S R, Carrico, A W et al. · Biological psychology · 2002 · DOI
This study compared symptoms between people with ME/CFS, people with depression, and healthy controls to understand which symptoms are specific to ME/CFS. The researchers found that certain pain symptoms (headaches, sore throat, joint and muscle pain) were common in ME/CFS but also appeared in depression. However, ME/CFS patients uniquely experienced widespread muscle weakness and various heart, lung, and nervous system symptoms that weren't seen in the other groups.
This research highlights important gaps in the current ME/CFS diagnostic criteria by identifying symptoms common to both ME/CFS and depression, as well as symptoms unique to ME/CFS that deserve consideration in case definitions. Understanding symptom specificity helps clinicians differentiate ME/CFS from other conditions like depression and may improve diagnostic accuracy and patient outcomes.
This study does not establish causation or explain the biological mechanisms underlying ME/CFS symptoms. It also does not prove that the identified unique symptoms should be added to diagnostic criteria without further validation, nor does it determine whether symptom severity or longitudinal patterns differ between groups.
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
Jason, L A, Torres-Harding, S R, Carrico, A W, & Taylor, R R (2002). Symptom occurrence in persons with chronic fatigue syndrome.. Biological psychology. https://doi.org/10.1016/s0301-0511(01)00120-x
BibTeX
@article{mecfsatlas-jason-2002-symptom-occurrence,
author = {Jason, L A and Torres-Harding, S R and Carrico, A W and Taylor, R R},
title = {Symptom occurrence in persons with chronic fatigue syndrome.},
journal = {Biological psychology},
year = {2002},
doi = {10.1016/s0301-0511(01)00120-x},
note = {PubMed: 11790441},
url = {https://www.mecfsatlas.com/evidence/jason-2002-symptom-occurrence},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/jason-2002-symptom-occurrence
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