The shoulder consists of  several joints that combine with tendons and muscles to allow a wide range of motion in the arm — from combing your hair your back to scratching your back.

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Increased mobility has its price though, It may lead to increasing problems with instability or impingement of the soft tissue or bony structures in your shoulder, resulting in pain. You may feel pain only when you move your shoulder, or all of the time. The pain may be temporary or it may continue and require medical diagnosis and treatment.

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The shoulder joint is made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle).

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The head of your upper arm bone fits into a rounded socket in your shoulder blade. This socket is called the glenoid. A combination of muscles and tendons keeps your arm bone centered in your shoulder socket. These tissues are called the rotator cuff. They cover the head of your upper arm bone and attach it to your shoulder blade.

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Most shoulder problems fall into four major categories:

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• Tendon inflammation (bursitis or tendinitis) or tendon tear

• Instability

• Arthritis

• Fracture (broken bone)