Bursitis (bur-SY-tis) is a painful condition that affects the small, fluid-filled sacs — called bursae (bur-SEE) — that cushion the bones, tendons, and muscles near your joints.
Bursitis occurs when bursae become inflamed. The most common locations for bursitis are in the shoulder, elbow, and hip.
Symptoms include pain, swelling, and stiffness.
Common areas include the knees, shoulders, elbows, and hips.