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Your back is complex system, made of bone, disks, a jelly-like substance between the disks, and nerves. When you bend over or lift anything heavy, it's easy to do it in such a way that your back is bending the wrong way and you could slip a disk, pull a muscle or otherwise hurt your lower back.
Sometimes, back pain happens a while after the initial injury as the muscles begin to tighten up as they try to protect your back from further injury.
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