Calcific tendinitis (also commonly written as calcific tendonitis) is a condition in which calcium deposits build up within the tendons of the rotator cuff — most commonly in the supraspinatus tendon. These deposits can cause significant shoulder pain, particularly when the arm is raised above shoulder height or during everyday activities such as reaching or dressing.
The condition progresses through recognised phases. During the formative phase, calcium is deposited gradually and may cause little discomfort. During the resorptive phase — when the body begins to break down the deposit — pain can become severe and often acute, arising with little warning. This is the phase in which most patients seek urgent specialist review.
Calcific tendinitis is more common in women and typically affects people between the ages of 30 and 60. It can occur in the absence of any obvious injury or overuse.