Back pain or low back pain does not have to be something you live with. Back pain is common and can be caused by a spinal problem.
http://www.back.com/

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The human back is the large posterior area of the human body, rising from the top of the buttocks to the back of the neck and the shoulders. It is the surface opposite to the chest ...
http://en.wikipedia.org/wiki/Back

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Back pain (also known "dorsalgia") is pain felt in the back that usually originates from the muscles, nerves, bones, joints or other structures in the spine.
http://en.wikipedia.org/wiki/Back_pain