Elbow bursitis is caused by irritated and inflamed bursae in between the bones and soft tissues of the elbow. Bursae are small sacs filled with fluid that aid in the smooth movements of bones and tissues against one another. When irritated or inflamed the sacs fill with more fluid than normal and this creates pain and limited movement. Bursitis is commonly caused by trauma, pressure, infections and certain medical conditions.
For more information visit the American Academy of Orthopaedic Surgeons website: https://orthoinfo.aaos.org/en/diseases–conditions/elbow-olecranon-bursitis/