Elbow bursitis is also referred to as olecranon bursitis, and it is known for causing fluid to collect in a sac, which is found behind the elbow known as the olecranon bursa. This ailment is one of the most common types of bursitis experienced across the world today. In simple terms, a bursa is a slippery collection of tissue that permits the smooth movement of the joint around bony prominences, such as the area behind the elbow. When the bursa is inflamed, the sac can fill with fluid, which causes noticeable inflammation and pain around the elbow.