6. Arthritis
Another cause of shoulder pain can be arthritis, and there are many types of arthritis that could be responsible. In terms of causing pain in the shoulder though, osteoarthritis, which occurs as a result of wear and tear, is by far the most common.
Overuse causes wear and tear and for the vast majority of people, there is little way of avoiding using your shoulder virtually all of the time. The symptoms which cause pain from osteoarthritis include stiffness and swelling, and these usually develop from middle age and get worse over time.
Treatment is complicated, as movement can both help and hinder recovery and repair. Where a shoulder is kept completely immobilized, the threat of frozen shoulder creeps in, which is another extremely painful thing to endure, however when a shoulder is kept moving, it is possible that the wear and tear damage can be exacerbated or worsened even.