Martínez-Lavín, Manuel · Clinical rheumatology · 2021 · DOI
Quick Summary
This article explores whether structures called dorsal root ganglia (DRG)—small nerve clusters along the spine—might be the main source of pain in fibromyalgia. These ganglia contain pain-sensing nerve cells and immune molecules that can become overactive. Recent evidence suggests that in some fibromyalgia patients, these nerve clusters show signs of damage and increased pain signaling.
Why It Matters
For ME/CFS patients with comorbid fibromyalgia, this framework offers a potential biological explanation for widespread pain and suggests that small fiber nerve pathology may be a treatable target. Understanding DRG involvement could help researchers identify why some patients develop neuropathic pain after physical stressors and may open new therapeutic avenues beyond symptom management.
Observed Findings
Skin biopsy shows small nerve fiber pathology in approximately 50% of fibromyalgia patients.
Corneal confocal microscopy demonstrates strong correlation between corneal denervation and small fiber neuropathy symptom burden in fibromyalgia patients.
ME/CFS patients with comorbid fibromyalgia show exercise-induced overexpression of pro-nociceptive molecules in dorsal root ganglia.
Severe fibromyalgia is associated with particular dorsal root ganglia ion channel genotypes.
Inferred Conclusions
Dorsal root ganglia may serve as a neural hub where diverse physical and environmental stressors are converted into neuropathic pain in fibromyalgia.
Pro-nociceptive molecules in the dorsal root ganglia represent promising therapeutic targets for fibromyalgia treatment.
Small nerve fiber pathology in dorsal root ganglia and peripheral nerves is a measurable pathophysiological feature in a subset of fibromyalgia patients.
Remaining Questions
Does dorsal root ganglia pathology precede fibromyalgia symptom onset, or is it a consequence of chronic pain states?
What specific environmental and physical stressors trigger the phenotypic changes in human dorsal root ganglia that lead to pain amplification?
What This Study Does Not Prove
This perspective article does not prove that DRG dysfunction causes fibromyalgia—it presents correlational and mechanistic evidence that is largely suggestive. The study does not establish whether DRG pathology is a primary cause or a secondary consequence of fibromyalgia, nor does it demonstrate efficacy of any DRG-targeted treatment in humans. The findings in rodent stress models may not directly translate to human disease.