Fleig, Katherine, Nahin, Richard, Stussman, Barbara et al. · BMC public health · 2026 · DOI
A survey of over 86,000 US adults found that approximately 1.5% reported ever receiving an ME/CFS diagnosis. Among those, about 21% reported they no longer have the condition (Past ME/CFS), though roughly 40–50% of this group still experience symptoms and functional limitations similar to those currently diagnosed. This study observed that people who report having recovered from ME/CFS remain more impaired than those who never had the diagnosis, suggesting that reported recovery does not necessarily mean full symptom resolution.
Understanding the natural history of ME/CFS—including reported recovery patterns—is essential for establishing realistic prognosis and identifying factors that may underlie symptomatic improvement or remission. This is one of the first population-level estimates of the proportion of US adults reporting ME/CFS recovery, providing epidemiological context for research into disease trajectories and potential therapeutic targets.
This study does not establish what causes remission or recovery in ME/CFS, nor does it clarify whether those reporting Past ME/CFS truly recovered or are reclassifying their diagnosis. It does not identify mechanisms of improvement, does not validate case definitions, and does not distinguish between subjective symptom change and objective physiological recovery. Cross-sectional design prevents inference of causation or temporal relationships.
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
Fleig, Katherine, Nahin, Richard, Stussman, Barbara, Wilkerson, Miciah, Unger, Elizabeth R, Lin, Jin-Mann S, et al. (2026). Myalgic Encephalomyelitis/Chronic Fatigue Syndrome diagnostic reporting in the 2021-2023 National Health Interview Survey.. BMC public health. https://doi.org/10.1186/s12889-026-27598-5
BibTeX
@article{mecfsatlas-fleig-2026-myalgic-encephalomyelitis,
author = {Fleig, Katherine and Nahin, Richard and Stussman, Barbara and Wilkerson, Miciah and Unger, Elizabeth R and Lin, Jin-Mann S and Walitt, Brian},
title = {Myalgic Encephalomyelitis/Chronic Fatigue Syndrome diagnostic reporting in the 2021-2023 National Health Interview Survey.},
journal = {BMC public health},
year = {2026},
doi = {10.1186/s12889-026-27598-5},
note = {PubMed: 42104344},
url = {https://www.mecfsatlas.com/evidence/fleig-2026-myalgic-encephalomyelitis},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-12. https://www.mecfsatlas.com/evidence/fleig-2026-myalgic-encephalomyelitis
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