Calcific Tendonitis refers to a build-up of calcium in the rotator cuff, and is often aggravated by an existing condition, such as Impingement or conventional tendonitis in the shoulder. When calcium builds up in the area, pain results from acute inflammation. Fluid movement of the joint is reduced. Calcium is deposited in the rotator cuff, between the humerus and acromion inhibiting the normal, friction-free movement of the joint. Impingement or tendonitis, which reduce the mobility of the joint leads to degenerative change and Calcium deposition. Frozen Shoulder is signified by pain and stiffness in the shoulder joint; limited range of motion and pain during nighttime rest are common symptons. A frozen shoulder (known also as adhesive capsulitis) is a condition that commonly occurs in older athletes. Frozen shoulder is five times more common in people with diabetes, though the reason for this is unknown. A lining of fibrous tissue, known as a capsule, surrounds the shoulder joint. The capsule is fully stretched when the arm is raised above the head, and it hangs down as a small pouch when the arm is lowered. Frozen shoulder occurs when this lining becomes thickened and swollen. It is thought a frozen shoulder may come on as a result of a previous injury, but also can come on for no apparent reason or may be triggered by a mild injury in the shoulder area. There are three phases to this condition, starting with pain, then stiffness and finally a stage of resolution as the pain eases and most of the movement returns.