Stussman, Barbara, Williams, Ashley, Snow, Joseph et al. · Frontiers in neurology · 2020 · DOI
This study asked 43 ME/CFS patients about post-exertional malaise (PEM)—the worsening of symptoms that happens after physical or mental activity. Patients described three main types of symptoms that get worse after exertion: exhaustion, trouble thinking clearly, and muscle/nerve problems. Most patients said their symptoms started within 24 hours after activity and felt worst around 3 days later, and they needed complete rest to recover.
Post-exertional malaise is a hallmark feature of ME/CFS that significantly impairs patients' quality of life, yet it remains poorly understood. This study provides detailed patient perspectives on PEM that can inform clinical recognition and guide future research toward identifying distinct PEM subtypes that might respond to different treatments.
This qualitative study does not prove the biological mechanisms underlying PEM or establish cause-and-effect relationships. It also does not quantify symptom severity objectively or identify biomarkers, and findings may not be generalizable to all ME/CFS patients since participants self-selected for focus group participation.
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
Stussman, Barbara, Williams, Ashley, Snow, Joseph, Gavin, Angelique, Scott, Remle, Nath, Avindra, et al. (2020). Characterization of Post-exertional Malaise in Patients With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.. Frontiers in neurology. https://doi.org/10.3389/fneur.2020.01025
BibTeX
@article{mecfsatlas-stussman-2020-characterization-post,
author = {Stussman, Barbara and Williams, Ashley and Snow, Joseph and Gavin, Angelique and Scott, Remle and Nath, Avindra and Walitt, Brian},
title = {Characterization of Post-exertional Malaise in Patients With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome.},
journal = {Frontiers in neurology},
year = {2020},
doi = {10.3389/fneur.2020.01025},
note = {PubMed: 33071931},
url = {https://www.mecfsatlas.com/evidence/stussman-2020-characterization-post},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/stussman-2020-characterization-post
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