Hip bursitis (also called trochanteric bursitis) affects the hip joint. The bursa are fluid-filled sacs that cushion the muscles, ligaments and tendons, helping them to glide smoothly over bone. Bursitis is a condition that causes the bursa to swell, resulting in pain and tenderness. It can be acute (short-lived) or may become chronic (on-going and long-term).
Over time, the bursa can thicken causing any swelling to worsen and leading to loss of movement and increasing muscle weakness.