Bursitis pathophysiology

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Pathophysiology

A bursa is a small, fluid-filled sac that acts as a cushion between a bone and other moving parts: muscles, tendons, or skin. Bursae are found throughout the body. Bursitis occurs when a bursa becomes inflamed (redness and increased fluid in the bursa).

Injuries, overuse, and repetitive stress are common causes of bursitis. Certain diseases, such as arthritis and gout, might also cause it. Bursitis is also commonly caused by direct trauma to a joint. Bursitis may occur at the knee or elbow, from kneeling or leaning on the elbows longer than usual on a hard surface, for example. It occurs more often with age.

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