Shoulder injuries are another common joint issue among athletes, particularly those who perform repetitive, intense overhead motions. Swimmers, tennis players, pitchers, and weightlifters are the most vulnerable to shoulder injuries. Everyday activities and work carried out by contractors can also cause shoulder injuries, like painting, hanging curtains, and gardening. Muscles, ligaments, and tendons are the components that are most affected by these activities. The shoulder is comprised of several joints, tendons, and muscles which give a large range of motion to the arm. Tendinitis occurs when the rotator cuff tendons become irritated. Because this is such a complex structure, shoulders are vulnerable to a variety of problems.