Bursitis
Bursitis is a painful condition. Small sacs called bursae get inflamed. Bursae are pockets between your muscles and your bones. Your bursa help you move without pain. In bursitis, the inflammation is often caused by extra fluid in the bursae. The most common places to have bursitis are in your hip and shoulder. You can also have bursitis in your elbow, knee and toe.