Andersen, M M, Permin, H, Albrecht, F · Journal of psychosomatic research · 2004 · DOI
This study followed 33 people with ME/CFS for 5 years to see how their illness affected their daily lives. Researchers found that most people remained severely disabled, with very few experiencing meaningful recovery. While emotional well-being sometimes improved over time, problems like difficulty reading and allergies often got worse.
Long-term follow-up studies are critical for understanding ME/CFS natural history and prognosis. This research documents the persistent severity of functional impairment and suggests that recovery is rare, which has important implications for patient expectations, healthcare resource allocation, and the urgent need for effective treatments.
This study does not establish causation for symptom changes or prove why improvement is uncommon. The small sample size (n=33) and single-center design limit generalizability. The study also does not evaluate specific treatments or interventions that might alter these trajectories.
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
Andersen, M M, Permin, H, & Albrecht, F (2004). Illness and disability in Danish Chronic Fatigue Syndrome patients at diagnosis and 5-year follow-up.. Journal of psychosomatic research. https://doi.org/10.1016/S0022-3999(03)00065-5
BibTeX
@article{mecfsatlas-andersen-2004-illness-disability,
author = {Andersen, M M and Permin, H and Albrecht, F},
title = {Illness and disability in Danish Chronic Fatigue Syndrome patients at diagnosis and 5-year follow-up.},
journal = {Journal of psychosomatic research},
year = {2004},
doi = {10.1016/S0022-3999(03)00065-5},
note = {PubMed: 15016582},
url = {https://www.mecfsatlas.com/evidence/andersen-2004-illness-disability},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/andersen-2004-illness-disability
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