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Bursas are small, fluid-filled sacs that cushion two body parts to move against each other. Joints, tendons, ligaments, muscles, and boney prominences have bursas to allow for smooth movement.
When a bursa becomes inflamed and swollen, it is known as bursitis. This often painful condition can be frustrating and may restrict mobility. But, bursitis is very treatable, and most people fully recover.
The most common sites of bursitis are the knee and elbow joints. However, bursitis can occur anywhere a bursa undergoes excessive stress. Common symptoms include:
Anything that irritates a bursa can cause bursitis. The bursas at joints are particularly vulnerable. The most common causes include:

A majority of cases of bursitis will heal on their own. Early care can reduce pain and speed up a return to normal activity. Your doctor will likely recommend:
For more severe cases of bursitis, or those that do not respond to conservative treatment, your doctor may recommend further evaluation and treatment.
If you had bursitis in the past or currently do activities that stress your joints, there are things you can do to reduce your likelihood of bursitis: