Anderson, G, Berk, M, Maes, M · Acta psychiatrica Scandinavica · 2014 · DOI
This review examined research showing that the physical symptoms experienced in ME/CFS, depression, and somatization (medically unexplained symptoms) have real biological causes, not just psychological ones. The authors found that inflammation, immune system activation, and changes in how the body breaks down certain nutrients are linked to symptoms like fatigue, pain, and autonomic problems. Understanding these biological pathways may help explain why these conditions overlap and why symptoms feel so physically real.
This work validates that ME/CFS symptoms have measurable biological underpinnings rather than being primarily psychological, which is crucial for patient recognition and clinical legitimacy. Identifying shared immune-inflammatory pathways across depression, somatization, and ME/CFS may inform better diagnostic approaches and targeted treatments for conditions that are often dismissed or misdiagnosed.
This review does not establish causation definitively—it identifies associations and correlations in existing literature. It does not prove these biological pathways are the sole cause of symptoms in all patients, nor does it demonstrate that all patients with these diagnoses share identical biomarker profiles. The narrative methodology also cannot quantify the strength or consistency of findings across studies.
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 →
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Primary citation
Anderson, G, Berk, M, & Maes, M (2014). Biological phenotypes underpin the physio-somatic symptoms of somatization, depression, and chronic fatigue syndrome.. Acta psychiatrica Scandinavica. https://doi.org/10.1111/acps.12182
BibTeX
@article{mecfsatlas-anderson-2014-biological-phenotypes,
author = {Anderson, G and Berk, M and Maes, M},
title = {Biological phenotypes underpin the physio-somatic symptoms of somatization, depression, and chronic fatigue syndrome.},
journal = {Acta psychiatrica Scandinavica},
year = {2014},
doi = {10.1111/acps.12182},
note = {PubMed: 23952563},
url = {https://www.mecfsatlas.com/evidence/anderson-2014-biological-phenotypes},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-26. https://www.mecfsatlas.com/evidence/anderson-2014-biological-phenotypes
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