Whenyou're tired at the end of your run, it's common to slump over alittle, which can lead to neck, shoulder, and lower-back pain.

当你最后结束累了的时候，趴下去一点点是很正常的，这可以导致脖子，肩膀和下背部疼痛。

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This would also help explain why chronic pains such as lower-back pain and osteoarthritis fail to respond well to traditional pain therapies.

这或许也能有助于解释为什么那些传统病痛治疗专家对于下背疼痛和骨关节炎之类的慢性疼痛无从下手。

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There are two main forms of lower back pain: acute and chronic.

下背部的疼痛发主要有两种类型：急性和慢性。

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The researchers say this suggests lower-back pain patients have an enhanced response to pain in some brain regions, and a diminished response in others.

BBC: Brain to blame for mystery back pain

"It's common with someone that hasn't done much running to get knee pain, back pain - any issues with their lower limbs, " says Harrison.

CNN: Prevention better than cure

On the other side are doctors, many of them pain medicine specialists, who believe narcotics can be used safely on a long-term basis by patients with problems such as lower back pain.

CNN: Facing chronic pain without drugs