Most people, when confronted with the death of a loved one, mourn intensely for a few weeks or months and then gradually manage to move on. A small percentage, however, become debilitated by the loss and can't resume their normal lives; they experience what psychologists call complicated grief. Functional magnetic resonance imaging (fMRI), which measures blood flow to various parts of the brain, has shown that grief activates regions of the brain associated with processing pain. (source: newsroom.ucla.edu)
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