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Bursitis: Why Joints Swell and Ache

A bursa is a small fluid-filled cushion. When it becomes inflamed, the nearby joint can swell and hurt. The basics explained.

In this article
  1. Common triggers

Bursae are small, fluid-filled sacs that cushion the points where tissues move over bone. When one becomes inflamed, the result is bursitis: swelling, warmth and pain around a joint such as the shoulder, elbow, hip or knee.

Common Triggers

  • Repetitive pressure or movement
  • A knock or injury to the area
  • Prolonged kneeling or leaning

Most episodes settle with rest and simple measures. Persistent or recurrent cases may need a closer look.

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