IT band syndrome or Iliotibial band syndrome (ITBS) is caused when the IT band on the outer part of the thigh and knee becomes irritated, causing pain.The IT band is a group of tissues or fibers that runs from the pelvis, through the thigh to the knee, or shin. The IT band stabilizes the knee.The pain caused by this condition is usually felt around the knee and is caused by overuse or repetitive knee movement seen in cyclists or runners. Overuse causes the band to tighten, and the tightened band rubs against the outer knee
ITBS usually affects the