First things first... there are about 160 bursae throughout the human body. A bursa is a fluid-filled sac lined with special cells which secrete a lubricating fluid rich in collagen and proteins. It functions as a gliding surface to decrease friction between the bones, tendons, and muscles near the joints. Bursitis, then, is inflammation of a bursa, and it can cause mild, moderate, or even severe pain.
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