What body parts should be looked at when treating shoulder pain?

There are three players we will be highlighting to guide you through fixing your shoulder pain. The first is the shoulder blade (scapula). The scapula's function is to support the arm when it moves. The second player is the upper arm bone (humerus), which is affected by how much support it receives from the scapula as well as a few key muscles. The third player is the forearm whose function is largely determined by the upper arm bone as well as a couple key muscles. As you can guess, forearm movement is therefore significantly affected by the shoulder blade.