(HealthDay News) -- The joints, tendons and muscles that make up the shoulder allow for a lot of flexibility. But an injury or a number of medical conditions can cause pain and limit the shoulder's movement.

The American Academy of Orthopaedic Surgeons says common reasons for shoulder pain include:

• Tendinitis, the inflammation of a tendon in the shoulder.
• Bursitis, the inflammation of a sac of fluid in the shoulder that's designed to limit friction during shoulder movement.
• An injury that leaves the shoulder joint out of position or unstable.
• Arthritis in the shoulder.