Bursitis

When a "bursa" becomes inflamed, the condition is known as bursitis.  A bursa is a fluid filled sac that functions as a gliding surface to reduce friction between moving tissues of the body, over an exposed or prominent bone or where a tendon passes over bone.

Most commonly, this is a noninfectious condition caused by inflammation resulting from local soft tissue trauma. On rare occasions, the hip bursa can become infected with bacteria.

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Letter from a patient [6]