Why is it so easy to hurt your lower back?

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.

Reference: 

Helma I Jzelenberg, MSc, et al. Effectiveness of a Back Pain Prevention Program. In Spine. Vol.32. No. 7. Pp. 711-719.

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