Bursitis is inflammation of a closed sac of fluid known as a bursa. Bursae are located in many areas of the body, usually where tendons and muscles move directly over bony prominences. The bursa helps this motion by providing a gliding surface between the two structures. Several bursae are found in and around the shoulder, elbow, hip, knee, and foot. Overuse injuries and chronic irritation are the usual causes of bursitis; however, direct trauma, systemic disorders such as rheumatoid arthritis and gout, and puncture wounds with subsequent infection may lead to this painful condition.
Learn about bursitis and what you can do to help prevent its recurrence by watching this video.