A frequent source of lower-back pain comes from two muscles you might not have heard of—and that makes sense since you rarely see them on those medical posters of human anatomy in doctor's offices.

What Is the Psoas Muscle? The psoas (pronounced so-ezz) muscles are two large muscles in your lower back. You have one on either side of your spine. They're the main muscular connection between your ...

Muscle injuries, nerve pain, and kidney inflammation can all cause lower left back pain. Learn about these causes and more. Medically reviewed by Anju Goel, MD Lower left back pain can be inconvenient ...

Lower back pain is a common ailment affecting many Americans, often exacerbated by improper lifting techniques. Excess weight, especially in the midsection, increases strain on lower back muscles, ...

Patients with lower back pain prescribed skeletal muscle relaxants in addition to NSAIDs report the same outcomes as placebo plus NSAIDs, new research shows. "Combining a skeletal muscle relaxant with ...

Deb Hipp is a freelance health and medical writer and editor who lives in Kansas City, Missouri. She is a former investigative reporter with more than 25 years of experience as a journalist and writer ...

Lower back pain is one of the most ubiquitous health complaints in the world. In fact, the World Health Organization says that low back pain is the single leading cause of disability worldwide—but ...

Medically reviewed by Amy Kwan, PT Lower right back pain can come from issues with muscles, discs, joints, or internal organs.  Numbness, tingling, or weakness with lower right back pain is often a ...