The causes of shoulder pain are seemingly endless, but let's go over some of the more common causes for pain in the shoulder. Shoulder pain may be the result of conditions, such as:
Neck and upper back tightness
Abnormal patterns of movement
Athletic injuries and automobile accidents
While a few of the items on this list may indicate localized swelling in the shoulder joint, more of them point to the spine as the probable source of pain. The nerves that control the shoulder originate in the spine. If the vertebrae around the neck and upper back are compressed or injured, the nerves that go to the shoulder will be irritated and cause pain. Even a minor spinal misalignment can interrupt communication between the nerves and the shoulder and a cascade of problems can begin. So, what appears as shoulder pain may actually be referred pain from the spinal column.