Iliotibial Band Syndrome (ITBS) is one of the most common overuse injuries among runners. It occurs when the iliotibial band, the ligament that runs down the outside of the thigh from the hip to the shin, is tight or inflamed. The IT band attaches to the knee and helps stabilize and move the joint. When the IT band isn't working properly, movement of the knee (and, therefore, running) becomes painful. IT band pain can be severe enough to completely sideline a runner for weeks, or even longer.
Once you notice ITB pain, the best way to get rid of it for good is to rest immediately. That means fewer miles, or no running at all. In the majority of runners, resting immediately will prevent pain from returning. If you don't give yourself a break from running, ITBS can become chronic.
To treat the ITBS, side stretches will help combined with regular massage and acupuncture to improve the healing process.
Always ask for professional advice to prevent your injury from getting worse.