Bursitis is the inflammation of one or more bursae (small sacs of connective tissue lined with synovial membrane and containing synovial fluid). There are more than 150 bursae in the human body. Bursae are located at bony prominences or joints to relieve pressure and decrease friction. Signs and symptoms include pain, swelling, and/or limited movement. Causes include repeated or excessive friction, gout, RA, and/or infection. Depending on the cause, bursitis may be acute or chronic.

Treatments for bursitis can include stem cell injections and joint and bursa injections.