A meta-analysis of neuroimaging evidence for acupuncture-mediated modulation of altered central pain processing in patients with chronic pain.

Chronic pain affects millions of people worldwide and can be incredibly difficult to treat. Unlike a simple injury that heals over time, chronic pain often involves changes deep within the brain itself — changes in how the nervous system processes and amplifies pain signals. This is called altered central pain processing, and most conventional treatments like medications rarely address it directly. Researchers wanted to know whether acupuncture could actually change the way the brain handles pain, not just temporarily mask the symptoms.

A new study published in Frontiers in Neurology reviewed 17 high-quality clinical trials involving 750 patients with chronic pain conditions, including joint and bone pain and migraines. The researchers used brain imaging data to see whether acupuncture was changing pain-related brain activity. What they found was remarkable.

Acupuncture produced measurable, positive changes in several key brain regions closely tied to pain perception — including the anterior cingulate cortex, the insula, the primary somatosensory cortex, the thalamus, and the default mode network. These are the very areas that become dysregulated in people living with chronic pain. At the same time, patients reported significant reductions in pain scores on a standard pain scale, with improvements large enough to be considered clinically meaningful. The odds of experiencing meaningful pain relief were more than four times greater with acupuncture compared to control groups. Only mild side effects were reported, making acupuncture a safe option for most people.

People with joint and bone pain appeared to benefit the most, though those with migraines also showed positive results. Researchers concluded that acupuncture works on two levels — easing the feeling of pain while also helping to reset the brain's pain-processing pathways.

If you are living with chronic pain and curious about acupuncture, speak with a licensed and board-certified acupuncturist to discuss whether it may be right for your situation.

This systematic review and meta-analysis (PROSPERO-registered) synthesized 17 RCTs (n = 750) examining acupuncture's modulatory effects on central pain processing via neuroimaging outcomes in chronic pain populations, predominantly osteoarticular pain and migraine. Acupuncture produced statistically significant improvements across three neuroimaging clusters: ACC/insula (MD = 0.27, p < 0.00001), S1/thalamus (MD = 0.30, p < 0.00001), and default mode network (MD = 0.29, p < 0.00001). Clinically, acupuncture reduced VAS scores by a mean difference of 2.31 points (p < 0.00001), exceeding the established MCID, and increased pain relief rate (OR = 4.30, p < 0.00001). GRADE assessment rated pain relief rate evidence as high quality. Osteoarticular subtypes demonstrated more pronounced efficacy. Adverse events were mild and infrequent. Limitations include heterogeneity in neuroimaging modalities, pain subtypes, and short follow-up durations. Findings support acupuncture as a neurobiologically active, safe non-pharmacological intervention warranting subtype-specific protocol standardization in clinical practice.