What is shoulder bursitis?

What is shoulder bursitis?

Shoulder bursitis is the result of inflammation in the bursa. The bursae (bur-SEE) are potential fluid-filled sacs that are part of the skeletal system. They cushion the space between bones and connective tissue, allowing tendons, muscle and bone to move together.

In the shoulder, the subacromial bursae cushion the area between the rotator cuff tendons and the acromion (the highest point of the shoulder blade or scapula). Bursae allow the tendons and bones to glide without friction when you move and lift your arms.

Injuries or overuse can cause fluid to collect in bursae, causing bursitis. Painful swelling may come on gradually or suddenly. Healthcare providers may use the medical term subacromial bursitis or rotator cuff tendinitis to refer to bursitis that affects the shoulder.