New Research Confirms: Chronic Pain Rewires Your Brain's Sensitivity to Everything

By Dr. Jason Forward, DC. Practicing chiropractor in Tulsa, Oklahoma. Posted April 17, 2026.

What Is Central Sensitization and Why Should You Care?

Central sensitization is a concept that has been gaining traction in pain science for the past decade. In simple terms, it means your central nervous system (brain and spinal cord) has become overly reactive. It amplifies incoming signals from your body, making normal sensations feel more intense or even painful.

Think of it like a stereo system. When everything is working normally, the volume sits at a comfortable level. You hear what you need to hear. Background noise stays in the background. But in central sensitization, someone turned the volume to 10 and broke the knob off. Everything is louder. Not just the music. The static, too.

That is what this study measured directly for the first time with brain imaging. Chronic back pain does not just make your back more sensitive. It makes your entire sensory system more reactive.

What the Brain Imaging Showed

The researchers had participants lie in an MRI scanner while listening to sounds at various volumes and receiving pressure stimulation. They measured both the subjective experience (how unpleasant do you rate this?) and the objective brain response (what regions are lighting up?).

Here is what they found:

Chronic back pain patients rated sounds as more unpleasant than controls. Not a little more. The effect size was medium to large. The higher someone's back pain level, the more unpleasant they found everyday sounds. This is not about hearing loss or ear problems. Their ears were fine. Their brains were amplifying the signal.

Brain scans showed hyperactivity in the primary auditory cortex and insula. The auditory cortex processes sound. The insula integrates sensory information with emotional context. Both were running hotter in chronic pain patients than in controls. The brain was treating normal-volume sounds as if they were threatening.

The medial prefrontal cortex was underactive. This region normally acts as a top-down regulator. It is the part of the brain that says "that sound is not dangerous, turn the response down." In chronic pain patients, that dampening mechanism was not doing its job. The brain was all gas pedal, not enough brake.

Why Sound Sensitivity Is a Big Deal for Pain Treatment

If chronic back pain only made your back hurt, treatment would be straightforward: find the structural problem, fix it, pain goes away. But this study shows that chronic pain changes how your brain processes ALL incoming information. That explains several things that frustrate both patients and clinicians:

Why treatments that worked before stop working. If your nervous system is globally amplified, a treatment that reduces mechanical pain by 30% might feel like it barely helped. The remaining pain signal is being cranked up by the brain.

Why patients with similar imaging findings have wildly different pain levels. Two people with the same MRI findings can have completely different pain experiences. Central sensitization is a major reason why. It is not about what the spine looks like. It is about how the nervous system is interpreting signals from the spine.

Why chronic pain patients often have other sensory sensitivities. Light sensitivity, noise sensitivity, sensitivity to touch or temperature. These are common in chronic pain populations. This study provides the neurological evidence for why. The amplification is not limited to pain pathways.

The Treatment Angle: Pain Reprocessing Therapy

The study did not just measure the problem. It tested a potential solution. A subset of the chronic pain patients received pain reprocessing therapy (PRT), a psychological approach developed by Alan Gordon at the Pain Psychology Center in Los Angeles.

PRT works on the premise that much of chronic pain is maintained by the brain's learned threat response. The therapy helps patients reappraise pain signals as non-dangerous, gradually reducing the brain's threat interpretation of those signals.

The results were promising:

• PRT reduced the exaggerated unpleasantness ratings for low-intensity sounds compared to placebo.
• Brain scans showed increased medial prefrontal cortex activity in the PRT group, meaning the brain's dampening mechanism was coming back online.
• Previous research by the same team found that roughly two-thirds of PRT participants became pain-free or near pain-free, compared to about 20% improvement in placebo groups.

This is significant because it means the brain changes associated with chronic pain are not permanent. They can be reversed, at least partially, with the right approach.

What This Means for How I Treat Chronic Pain in Tulsa

I see chronic pain patients regularly at Vanguard Chiropractic. Some have been hurting for months. Some for years. A common pattern is the patient who has a real structural issue (disc bulge, facet arthritis, joint restriction) but whose pain response seems disproportionate to what the exam findings show.

This study validates what I have observed clinically: chronic pain is not just a spine problem. It becomes a nervous system problem. The mechanical issue may be what started it, but the brain's amplified response is what maintains it.

Here is how that affects my approach:

I still address the mechanical component. Joint restrictions, muscle guarding, and segmental dysfunction are real. They create real nociceptive input. Reducing that input through adjustments is still valuable, even in centrally sensitized patients. If the spine is sending less irritation, the brain has less raw material to amplify.

I explain pain science to my patients. Understanding what is happening in your nervous system is therapeutic in itself. Research shows that pain neuroscience education reduces pain intensity and disability in chronic pain populations. When a patient understands that their brain is amplifying signals, the pain becomes less frightening. Less fear means less threat response.

I recognize when chiropractic alone is not enough. If a chronic pain patient is not improving with manual therapy after a reasonable trial, it may be because the central sensitization component is dominant. In those cases, I recommend they explore pain psychology, mindfulness-based stress reduction, graded exposure to activity, or cognitive behavioral therapy in addition to their chiropractic care. Not instead of it. In addition to it.

Signs Your Pain May Involve Central Sensitization

Not everyone with back pain has central sensitization. It tends to develop when pain persists beyond the normal tissue healing timeline (typically 3 to 6 months). Here are some signs:

• Pain that has lasted more than 3 months
• Pain that seems disproportionate to any identifiable structural issue
• Increased sensitivity to touch, pressure, heat, or cold in areas beyond the painful region
• Sensitivity to bright lights, loud sounds, or strong smells
• Pain that spreads to new areas over time
• Fatigue, poor sleep, and difficulty concentrating alongside the pain
• Treatments that used to help no longer seem effective

If several of these apply to you, it does not mean your pain is "all in your head." It means your nervous system has adapted to the pain in ways that amplify the experience. That is a neurological process, not a psychological weakness. And the good news from this study is that those changes appear to be reversible.

The Practical Takeaway

If you are dealing with chronic back pain and it feels like everything bothers you more than it used to, this study says you are not imagining it. Your brain is literally amplifying sensory information in a measurable way. That validation matters.

But it also means that the most effective treatment approach is likely multimodal. Address the mechanical component (chiropractic, physical therapy, movement). Address the neurological component (pain education, stress management, possibly pain reprocessing therapy). And understand that getting better may not be about finding the one thing that fixes it. It may be about reducing the total load on a nervous system that has been running too hot for too long.