Nacul, Luis C, Lacerda, Eliana M, Campion, Peter et al. · BMC public health · 2011 · DOI
This study measured how ME/CFS affects daily life and well-being in 170 patients and 44 family caregivers. Using a standard health questionnaire, researchers found that ME/CFS causes severe disability—worse than many other chronic illnesses like cancer—affecting both physical abilities and mental health. The emotional burden also significantly impacts the family members and caregivers who support people with ME/CFS.
This research provides quantified evidence that ME/CFS causes greater disability than many other recognized chronic diseases, validating patient experiences of profound functional impairment. The finding that caregivers are also significantly affected highlights the broader family and social impact of ME/CFS, which may inform support services and policy decisions.
This study does not establish cause-and-effect relationships or explain the biological mechanisms underlying ME/CFS disability. The cross-sectional design captures a single point in time and cannot demonstrate whether functional decline precedes or follows symptom onset. The findings cannot be generalized to ME/CFS patients outside the study's age range (18–64) or to those with different disease severity profiles.
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
Nacul, Luis C, Lacerda, Eliana M, Campion, Peter, Pheby, Derek, Drachler, Maria de L, Leite, José C, et al. (2011). The functional status and well being of people with myalgic encephalomyelitis/chronic fatigue syndrome and their carers.. BMC public health. https://doi.org/10.1186/1471-2458-11-402
BibTeX
@article{mecfsatlas-nacul-2011-functional-status,
author = {Nacul, Luis C and Lacerda, Eliana M and Campion, Peter and Pheby, Derek and Drachler, Maria de L and Leite, José C and Poland, Fiona and Howe, Amanda and Fayyaz, Shagufta and Molokhia, Mariam},
title = {The functional status and well being of people with myalgic encephalomyelitis/chronic fatigue syndrome and their carers.},
journal = {BMC public health},
year = {2011},
doi = {10.1186/1471-2458-11-402},
note = {PubMed: 21619607},
url = {https://www.mecfsatlas.com/evidence/nacul-2011-functional-status},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-27. https://www.mecfsatlas.com/evidence/nacul-2011-functional-status
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