The aim of this study is to investigate the effect of ultrasound (US) therapy, administered in different modes, on pain, functionality, quality of life and iliotibial band (ITB) thickness in patients with iliotibial band syndrome (ITBS). The primary question of the study is: Is US therapy effective in reducing pain and improving functionality in ITBS? The secondary question is: Is US therapy effective in ITBS in terms of quality of life and ITB thickness? 75 participants were assigned to the exercise, exercise plus continuous US and exercise plus intermittent US groups and received 15 treatment sessions. Participants were assessed before treatment, at the end of treatment (after 15 sessions) and at 3 months post-treatment.