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 ...

The psoas major is a lengthy fusiform (or ‘spindle-shaped’) muscle that can be found on the side of the lumbar region of the vertebral column. It is also adjacent to the brim of the lesser pelvis area ...

Iliopsoas bursitis can cause pain and limited range of motion in the hip joint. The condition often develops from overuse in athletes or other people who exercise regularly. Iliopsoas bursitis ...