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What is the major cause of shoulder pain?
Arthritis. Arthritis is the result of the cartilage in a joint being worn out over time. I often describe the arthritis in the shoulder as having a “rusty hinge”. The cartilage in your joint is supposed to be a smooth surface that allows things to move easily; however, when the cartilage wears out as a result of arthritis it becomes a rough surface, or “rusty”.
