Overview

Bursitis is a painful condition in the joints that usually results from overuse or injury. Bursitis is inflammation of the bursa. A bursa is a small fluid-filled sac in the joint. It acts like a cushion between muscles, bones and tendons (the tough cords that hold muscles to bones). The bursa also helps muscles slide smoothly over bones or other muscles. It does this by lubricating the joint so it can move with less friction or rubbing.

Pressure or repeated overuse of the joint is the most common cause. Sometimes bursitis is caused by disease, such as rheumatoid arthritis or gout.

There are more than 150 bursae (plural of bursa) in the body. Bursitis can arise in any joint, but joints that get more pressure or repeated use are more likely to be affected. Shoulders, elbows, knees and feet are more prone to bursitis than other joints. Prolonged sitting may also put pressure on bursae near the hip joint, especially on the outer side of the hip, and in the buttocks.

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