The iliopsoas muscle is the major flexor of the hip joint, made up of the iliacus and psoas major muscles. Pain in the iliopsoas muscle can be caused by sitting too long, muscle imbalance, overuse, or ...

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 ...

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 ...