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Depression Heightens Sensitivity to Pain
Date:11/7/2008

MRI reveals relationship between mental condition and reaction to physical discomfort

FRIDAY, Nov. 7 (HealthDay News) -- When anticipating pain, the brains of people with depression kick into overdrive and hinder their ability to handle hurt, a new study shows.

The November issue of the Archives of General Psychiatry reports brain imaging also reveals that during the painful experience, activity then decreases in other areas, including those regions that handle pain modulation.

"The anticipatory brain response may indicate hypervigilance to impending threat, which may lead to increased helplessness and maladaptative modulation during the experience of heat pain," the authors wrote. "This mechanism could in part explain the high comorbidity of pain and depression when these conditions become chronic."

Chronic pain and depression often overlap, the authors wrote. More than 75 percent of depression patients have recurring or chronic pain, while between 30 percent and 60 percent of chronic pain patients also report symptoms of depression.

"Understanding the neurobiological basis of this relationship is important, because the presence of comorbid pain contributes significantly to poorer outcomes and increased cost of treatment in major depressive disorder," they wrote.

The research team, from the University of California, San Diego, in La Jolla, studied 30 adults, half with a major depressive disorder but not on medication for the condition and half without it. All wore devices that could heat their arms to painful levels, and all were given visual signals before the exercise as to whether they would feel painful heat or a more mild warmth.

The patients with depression also completed a questionnaire about their tendencies to magnify, ruminate over or feel helpless in the face of pain.

Compared with the controls, patients with depression showed increased activation in certa
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