Bursitis is inflammation of a bursa sac. The inflammation may result from arthritis in the joint or injury or infection of a bursa. Bursitis produces pain and tenderness and may limit the movement of nearby joints.
Bursitis can occur in the shoulders, elbows, hips, knees, heels and big toe. Injuries, overuse and repetitive stress are common causes of bursitis. Certain diseases, such as arthritis and gout, might also cause it. It sometimes occurs with tendinitis.