Bradley, L A, McKendree-Smith, N L, Alarcón, G S · Current review of pain · 2000 · DOI
Both fibromyalgia (FM) and ME/CFS cause muscle and joint pain, but the underlying reasons differ between these conditions. People with FM alone have unusually sensitive pain responses to light touch or mild pressure (called allodynia), while people with ME/CFS do not typically show this. This study examined what brain and hormone system differences might explain why these two conditions cause pain in different ways.
Understanding why FM and ME/CFS cause pain differently is crucial for developing targeted treatments and improving clinical diagnosis. Since these conditions are sometimes confused or occur together, clarifying their distinct pain mechanisms helps patients receive appropriate care and supports research into condition-specific interventions.
This review does not prove causation—it identifies correlations between biological abnormalities and pain symptoms. The study does not establish whether these neuroendocrine and neuropeptide differences are primary causes or secondary consequences of the conditions. Additionally, findings from 2000 may not capture the full complexity of these disorders as understood by current research.
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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