Why Shoulder Bursitis Happens and How You Can Treat It
Shoulder bursitis is inflammation of a bursa, a fluid-filled sac, in the shoulder joint. The bursa provides padding between bones, tendons, and ligaments to reduce friction and improve joint movement throughout the body. There are multiple bursae in the shoulder, but this condition most commonly affects one called the subacromial bursa.
Source: Verywell health