Structural and Functional Brain Alterations in Postherpetic Neuralgia: A Systematic Review and Voxel-Wise Coordinate-Based Meta-Analysis via the SDM-PSI Method.

What Happens to the Brain When Nerve Pain Won't Go Away After Shingles?

If you've had shingles and the burning, stabbing pain stuck around long after the rash healed, you're not imagining it — and you're not alone. This lingering condition is called postherpetic neuralgia (PHN), and it affects a significant number of shingles survivors, sometimes for months or even years.

Researchers wanted to understand what's actually happening inside the brain when PHN develops. To find out, they analyzed 21 brain imaging studies involving patients with PHN, looking at both brain structure and brain activity patterns.

What They Found

The brain scans revealed real, measurable changes in people living with PHN. Certain regions showed abnormal activity levels, including areas involved in processing sensory information, regulating emotions, and making decisions. Brain regions like the thalamus (your brain's pain relay station), the putamen (linked to emotion and movement), and the cerebellum all showed unusual patterns. Researchers also found that some areas of the brain had physically shrunk in gray matter volume — particularly regions connected to touch perception and emotional processing.

In short, chronic shingles pain doesn't just hurt — it gradually reshapes brain networks involved in how we feel, think, and cope.

What This Means for You

These findings suggest that PHN is a whole-brain condition, not just a localized nerve problem. Treatments that work on the nervous system at multiple levels — like acupuncture — may be especially relevant. Acupuncture has been studied for its ability to influence brain activity, reduce pain signaling, and support emotional regulation, making it a promising complementary option for people managing PHN.

If you're living with post-shingles nerve pain, speak with a licensed acupuncturist trained in neuropathic pain conditions to explore whether this approach may be right for you.

This systematic review and voxel-wise coordinate-based meta-analysis (SDM-PSI method) synthesized 21 studies (31 datasets) examining structural and functional neuroimaging in postherpetic neuralgia (PHN). Compared to healthy controls, PHN patients demonstrated hyperactivation in the right cuneus, left putamen, and right anterior thalamic projections, with hypoactivation in the right fusiform gyrus. VBM analyses identified gray matter reductions in the left Heschl's gyrus, right precentral gyrus, left postcentral gyrus, and left median cingulate/paracingulate cortex. PHN versus herpes zoster comparisons revealed increased cerebellar Crus II activity bilaterally. Heterogeneity was low-to-moderate; major clusters were robust on sensitivity analysis. Clinically, these convergent abnormalities across sensory, affective-cognitive, and cortico-basal ganglia networks support PHN as a central sensitization disorder. For acupuncture practitioners, these network-level biomarkers reinforce the rationale for neuromodulatory interventions targeting thalamo-cortical and limbic circuitry in PHN management.