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Overview

Bursitis is inflammation of a fluid-filled sac (called a bursa; plural is bursae) located in the joints (where two bones or a bone and a tendon meet). Bursae contain synovial fluid, which lubricates the joints. They reduce friction between the bones and muscles, tendons, and ligaments.

Inflammation of a bursa results in pain, tenderness, and swelling. Bursitis commonly occurs in the shoulders, hips, elbows, knees, heels, and wrists. The condition sometimes can develop with tendon...Read the full article