Overview
Bursitis is a painful condition that affects the small fluid-filled pads — called bursae (bur-SEE) — that act as cushions among your bones and the tendons and muscles near your joints. Bursitis occurs when bursae become inflamed.
Causes
Repetitive motions or positions that irritate the bursae around a joint (ex. throwing a baseball, leaning on elbows, kneeling)
Infection
Aging
Rheumatoid arthritis, gout, diabetes
Symptoms
Aching or stiffness of the affected joint
Increased pain when affected joint is moved or pressed on
Swelling
Redness
Diagnosis
Physical examination and medical history consultation
X-rays
MRI
Lab tests
Treatment
Rest
Ice
Non-steroidal anti-inflammatory medications
Antibiotics (if caused by infection)
Physical therapy
Corticosteroid injections
Surgery
Source: http://www.mayoclinic.com/health/bursitis/DS00032/DSECTION=lifestyle-and-home-remedies