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"A study earlier this year found that almost half of the US soldiers who have recently returned from deployment in Afghanistan or Iraq have chronic pain, and 15 percent use opioid painkillers."
As I have been in army (not US), I know that service can be physically very demanding, but almost half having chronic pains and 15% using opioid painkillers seems like a lot. From where and why they get such pains? Physical activities? Or is it purely mental?
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