According to one study, iliotibial band syndrome is one of the most common injuries in runners presenting with lateral knee pain, with an incidence estimated between 5% and 14%.
The first warning sign of injury usually is pain on the outside of your knee, at the hip or down the side of your leg. You may notice the pain right after an exercise class or run. IT band problems can be experienced by active adults, children, and student and adult competitive athletes.
Source: Medical Xpress