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The position of the subacromial bursa, between your acromion and the muscles of your rotator cuffBursitis is inflammation of a small fluid-filled sac that sits near one of your bones. These sacs are called bursae (plural) or bursa (singular), and they help to protect the tissues that slide over the bone when you move. The illustration shows the bursa in your shoulder. Inflammation here is called subacromial impingement, or subacromial bursitis.

You have more than 150 bursae in your body. The ones that most often develop bursitis are in your shoulder, elbow, hip, and knee.

Bursitis can happen if you:

Written by HealthInfo clinical advisers. Last reviewed July 2019.


In this section

Diagnosing bursitis

Treating bursitis

Page reference: 255218

Review key: HIBUR-255218