Bursitis is inflammation of the bursa, a sac associated with many joints, according to WebMD. Healthline notes that the occipital bone is a plate of the skull, located at the back, near the neck. Therefore, occipital bursitis is inflammation of the bursa at the back of the head.
Bursitis generally affects the joints of the limbs, such as the shoulder, elbow or knee, explains WebMD. It is often due to stress injuries, overuse, or chronic inflammatory diseases such as arthritis. Bursitis of the occipital bone is not considered one of the common bursitis conditions in humans. However, the "Textbook of Small Animal Orthopaedics," available online at the University of Pennsylvania website, notes that it afflicts young dogs. Excited puppies may strike their necks against low overhanging objects, causing the bursa of the occipital bone to undergo a stress injury.