A bursa is a fluid-filled sack that decreases shear forces between tissues of the body. Trochanteric bursitis (inflammation of a bursa) is caused by excessive stress on the bursa between the IT Band and the greater trochanter. Signs and symptoms include pain over the outer aspect of the hipbone, which often is exacerbated when lying on the affected side, standing on the affected leg, or excessive walking. Treatment often includes rest, ice, and compression, physical therapy including stretching and progressive strengthening, and steroid injection may be helpful.