Bursitis

A bursa is a small sac containing fluid that allows two surfaces to move smoothly in different directions. They tend to be found at points in the body where tendons or muscles glide over bones and surround large joints such as the shoulder, elbow or knee. Bursitis is simply the inflammation of a bursa. When caused by prolonged friction or pressure, Bursitis is also known as a 'beat' condition, for example, Beat Elbow. Beat Hand is similarly the name given to inflammation of the bursae in the hand, though it also describes a condition called subcutaneous cellulitis.