Bursitis is an inflammatory condition that affects the bursae which are small fluid filled sacs that lie between tendons and bones. These bursae help to reduce friction and provide cushion as the tendon glides over the bone. There are numerous bursea located in different joints throughout the body, however areas typically affected by bursitis are the shoulder, elbow, hip, knee and distal end of the achilles tendon. Bursitis usually occurs due to repetitive strain and excessive pressure on the joint.