Bursitis is inflammation of a bursa. A bursa is a thin sac that lies between bone and soft tissue near certain joints. A healthy bursa allows smooth movement of soft tissue over bone. Inflammation can make it painful to move the nearby joint.

Bursitis occurs most often in the:

  • Shoulder
  • Elbow
  • Knee
  • Hip

Bursitis in the Shoulder
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Bursitis may be caused by:

  • A blow to an area containing a bursa
  • Repetitive stress on the bursa
  • Infection in bursa
  • Long periods of pressure on joint—leaning on elbows, sitting or kneeling on hard surfaces
  • Medical conditions that cause inflammation in joints such as rheumatoid arthritis or gout

If the stress is not relieved, bursitis can become a long-term condition.