Chronic Back Pain Amplifies Sounds, Brain Research Reveals New Treatment Hope

People with chronic back pain don’t just experience physical discomfort – they may also perceive everyday sounds as harsher and more intense, according to a groundbreaking study from the University of Colorado Anschutz Medical Campus. Published in Annals of Neurology, the research identifies specific brain changes linked to this sound hypersensitivity and points to a promising treatment option.

Beyond the Back: How Chronic Pain Alters Sensory Perception

The study, led by Yoni Ashar, PhD, assistant professor of internal medicine and co-director of the Pain Science Program at the University of Colorado Anschutz School of Medicine, reveals that chronic back pain affects brain regions responsible for processing both the loudness of sound and its emotional impact. “Our findings validate what many patients have been saying for years that everyday sounds genuinely perceive harsher and more intense,” says Ashar. “Their brains are responding differently…This tells us chronic back pain isn’t just about the back. There’s a broader sensory amplification happening in the brain, and that opens the door for treatments that can support turn that volume down.”

Study Details: Comparing Pain and Brain Responses

Researchers compared 142 adults with chronic back pain to 51 pain-free control subjects. Participants underwent brain imaging (MRI) while performing tasks involving listening to sounds and rating their unpleasantness. The study found that individuals with chronic back pain reacted more strongly to auditory stimuli – on average, more intensely than 84% of those without pain.

Brain scans revealed that the changes weren’t occurring in the initial auditory processing areas, but in higher-level brain regions. Specifically, there was increased activity in the auditory cortex (which processes sound) and the insula (which processes emotional sensations). Simultaneously, the scans showed decreased activity in the medial prefrontal cortex, a brain region involved in regulating emotional responses. [2]

Pain Reprocessing Therapy: A Potential Breakthrough

The research team investigated the effectiveness of different treatment approaches, dividing participants with chronic back pain into three groups:

• Pain Reprocessing Therapy (PRT): Therapy sessions focused on helping patients reinterpret their pain as a result of brain amplification rather than structural issues in the back.
• Placebo Treatment: A saline injection administered in a supportive clinical setting.
• Usual Care: Participants continued with their existing treatments.

Results showed that PRT was the most effective treatment. It reduced the heightened brain response to sound and increased activity in brain regions that regulate unpleasant experiences. [2] “This shows that the brain’s exaggerated sensory response can improve with psychological treatment so instead of being something patients are stuck with, this sensitivity is treatable,” Ashar explained.

Previous research by Ashar demonstrated that PRT led to significant pain reduction or near-complete pain relief in approximately two-thirds of participants with chronic back pain, a substantially higher improvement rate than the roughly 20% seen in the placebo group. [1]

Future Research and Implications

Researchers are now exploring whether this heightened sensory sensitivity is a cause or a consequence of chronic back pain. Early evidence suggests that individuals naturally more sensitive to sensory input may be more prone to developing chronic pain after an injury. [1] Future studies will investigate whether this amplification extends to other senses (sight, smell, taste) and whether it occurs in other chronic pain conditions.

“These findings add to growing evidence that chronic back pain is not just a problem in the back, the brain plays a central role in driving chronic pain, by amplifying a range of sensations – sensory signals from the back, sounds, and likely other sensations as well,” Ashar concluded.