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Why chronic pain is all in your head
Date:7/1/2012

CHICAGO --- When people have similar injuries, why do some end up with chronic pain while others recover and are pain free? The first longitudinal brain imaging study to track participants with a new back injury has found the chronic pain is all in their heads - quite literally.

A new Northwestern Medicine study shows for the first time that chronic pain develops the more two sections of the brain --- related to emotional and motivational behavior --- talk to each other. The more they communicate, the greater the chance a patient will develop chronic pain.

The finding provides a new direction for developing therapies to treat intractable pain, which affects 30 to 40 million adults in the United States.

Researchers were able to predict, with 85 percent accuracy at the beginning of the study, which participants would go on to develop chronic pain based on the level of interaction between the frontal cortex and the nucleus accumbens.

The study is published in the journal Nature Neuroscience.

"For the first time we can explain why people who may have the exact same initial pain either go on to recover or develop chronic pain," said A. Vania Apakarian, senior author of the paper and professor of physiology at Northwestern University Feinberg School of Medicine.

"The injury by itself is not enough to explain the ongoing pain. It has to do with the injury combined with the state of the brain. This finding is the culmination of 10 years of our research."

The more emotionally the brain reacts to the initial injury, the more likely the pain will persist after the injury has healed. "It may be that these sections of the brain are more excited to begin with in certain individuals, or there may be genetic and environmental influences that predispose these brain regions to interact at an excitable level," Apkarian said.

The nucleus accumbens is an important center for teaching the rest
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Contact: Marla Paul
marla-Paul@northwestern.edu
312-503-8928
Northwestern University
Source:Eurekalert

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