Key Finding
Left-sided auricular vagus nerve stimulation reduced pro-inflammatory cytokines and increased anti-inflammatory markers and BDNF in women with fibromyalgia, despite not producing superior pain relief compared to sham treatment.
Researchers in Brazil investigated whether auricular acupuncture—specifically, needling points connected to the vagus nerve in the ear—could help women with fibromyalgia, a chronic condition causing widespread pain and fatigue. They wanted to know if the side of stimulation (left ear versus right ear) made a difference in outcomes.
Fifty-one women with fibromyalgia received either sham (placebo) treatment, right-ear vagus nerve stimulation, or left-ear vagus nerve stimulation. Each participant attended weekly sessions for four weeks and was monitored for 12 weeks total. The researchers measured pain levels, psychological symptoms, sleep quality, daily functioning, and blood markers related to inflammation and brain health.
While pain intensity didn't improve significantly more than sham treatment in either group, left-ear stimulation showed some promising effects. Women receiving left-sided treatment experienced modest improvements in overall symptom severity. More importantly, blood tests revealed that left-ear stimulation reduced inflammatory markers (IL-1β and TNF-α) while increasing anti-inflammatory compounds (IL-4 and IL-10) and brain-derived neurotrophic factor (BDNF), a protein that supports nerve health and healing.
This suggests that even though immediate pain relief wasn't achieved, left-sided auricular acupuncture may help address the underlying inflammatory processes and support neurological health in fibromyalgia patients. The study was exploratory, meaning larger trials are needed to confirm these findings and determine optimal treatment protocols.
For fibromyalgia patients considering acupuncture, these results suggest that the location of ear acupuncture points may matter for biological effects, though more research is needed to translate this into consistent pain relief. If you're interested in trying auricular acupuncture for fibromyalgia, seek treatment from a licensed acupuncturist experienced in treating chronic pain conditions.
This randomized, double-blind, sham-controlled trial (n=51) examined laterality effects of manual auricular vagus nerve stimulation (aVNS) in women with fibromyalgia. Participants received four weekly sessions of either sham, right-sided (aVNS-R), or left-sided (aVNS-L) stimulation, with 12-week follow-up. Primary outcome was pain intensity; secondary outcomes included psychological measures, sleep, function, quality of life, and inflammatory biomarkers.
No significant between-group differences emerged for pain intensity. However, aVNS-L demonstrated modest but significant reduction in global symptom severity and consistent immunomodulatory effects: decreased pro-inflammatory cytokines (IL-1β, TNF-α) and increased anti-inflammatory markers (IL-4, IL-10) plus elevated BDNF concentrations. Effect sizes were not reported.
Clinical takeaway: While aVNS did not outperform sham for pain relief, left-sided auricular stimulation produced favorable biological changes—reduced inflammation and enhanced neuroplasticity markers—suggesting potential disease-modifying effects in fibromyalgia. Laterality appears clinically relevant when targeting ABVN. Further investigation with larger samples and longer treatment duration is warranted to determine if biological changes translate to sustained clinical improvement.
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