Many things can cause lower back pain–muscle strains or spasms, sprains of ligaments (which attach bone to bone), joint problems or a "slipped disk." The most common cause is using your back muscles incorrectly while involved in activities you're not used to, like lifting heavy furniture or doing yard work.

A slipped disk (also called a herniated disk) happens when a disk between the bones of the spine bulges and presses on nerves. This is most often caused by twisting while lifting. But many people won't know what caused their slipped disk. In many cases, slipped disks and other lower back pain can be relieved by following a few simple methods.

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