Chronic pain harms brain

Long-term suffering of pain can trigger other pain related symtoms like sleep disorders, depression, anxiety and even debar the brain from making simple decisions. In a healthy brain, researchers found that all the regions exist in a state of equilibrium and when one region is active, the others quite down. But in people with chronic pain, a front region of the cortex mostly associated with emotion ''never shuts up,'' said Dante Chialvo, lead author and associate research professor of physiology at the Feinberg School. ''The areas that are affected fail to deactivate when they should,'' Science Daily quoted him as saying.

They are stuck on full throttle, wearing out neurons and altering their connections to each other.

This is the first demonstration of brain disturbances in chronic pain patients not directly related to the sensation of pain. The researchers led by Chialvo used functional magnetic resonance imaging (FMRI) to scan the brains of people with chronic low back pain and a group of pain-free volunteers while both groups were tracking a moving bar on a computer screen. The study showed the pain sufferers performed the task well but ''at the expense of using their brain differently than the pain-free group,'' Chialvo said.

He further said certain parts of the cortex were activated in the pain-free group, some others were deactivated, maintaining a cooperative equilibrium between the regions. This equilibrium also is known as the resting state network of the brain. In the chronic pain group, however, one of the nodes of this network did not quiet down as it did in the pain-free subjects.

''We know when neurons fire too much they may change their connections with other neurons and or even die because they can't sustain high activity for so long,''he explained.

This constant firing of neurons in these regions of the brain could cause permanent damage, Chialvo said. ''If you are a chronic pain patient, you have pain 24 hours a day, seven days a week, every minute of your life,'' Chialvo said. ''That permanent perception of pain in your brain makes these areas in your brain continuously active. This continuous dysfunction in the equilibrium of the brain can change the wiring forever and could hurt the brain,'' he added.

Lead researcher Chialvo hypothesized ''the subsequent changes in wiring may make it harder for you to make a decision or be in a good mood to get up in the morning. It could be that pain produces depression and the other reported abnormalities because it disturbs the balance of the brain as a whole.'' ''It is essential to study new approaches to treat patients not just to control their pain but also to evaluate and prevent the dysfunction that may be generated in the brain by the chronic pain,'' concluded the lead researcher Dante Chialvo.

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