Bursitis results from inflammation of the fluid-filled sacks called bursae that buffer tendons and bones. Overuse injuries cause the bursae to swell up, which leads to pain and tenderness. The shoulders, arms, and knees are the areas most often impacted by bursitis. Though not a serious condition, most people use over-the-counter painkillers and ice packs to treat bursitis. It is also important to rest the arm until the inflammation subsides.

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