Add Yahoo as a preferred source to see more of our stories on Google. Pain is always disconcerting regardless of where it occurs, but it can be especially worrisome if it emanates from the left side ...

Muscle injuries, nerve pain, and kidney inflammation can all cause lower left back pain. Learn about these causes and more.

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Among the myriad of medical treatments for low back pain—a leading cause of disability that affects more than 600 million ...