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 ...

Suppurative psoas abscess is an unusual lesion that is unfamiliar to many orthopaedic specialists, which can make an accurate and timely diagnosis problematic. The symptoms associated with this ...

Tight hip flexors, especially a deep muscle called the psoas, can silently stress your spine. Here's why this muscle deserves more attention—and how to strengthen it. Lower back pain is often blamed ...