(Newser) -
Electrical signals carry pain impulses to the brain—that much scientists know. But how to treat pain remains a question, LiveScience reports. Here's the scoop: It "is a complex mixture of emotions, culture, experience, spirit, and sensation," one expert said. In other words, it's hard to even define. People suffering from chronic pain like backaches have smaller brains. Maybe their neurons just get stressed out.
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