Bursitis is a condition characterized by inflammation of the bursae, small fluid-filled sacs that cushion and lubricate areas where tendons, muscles, skin, and bones rub against each other. This inflammation can cause pain, swelling, and limited range of motion in the affected joint. Bursitis commonly occurs in areas such as the shoulder, elbow, hip, or knee due to repetitive motions, overuse, or injury. Treatment typically involves rest, ice, anti-inflammatory medications, and physical therapy.