This document provides information about shoulder pain, including common causes and treatments. It describes how the shoulder is made up of ball-and-socket joints that allow a wide range of movement. Shoulder pain can be caused by issues in the muscles, tendons, bursae or joints, sometimes due to injury or conditions like arthritis. Specific shoulder conditions discussed include tendonitis, frozen shoulder, osteoarthritis, and polymyalgia rheumatica. Doctors may diagnose the issue through examination of symptoms and range of motion, and sometimes imaging tests. Treatment depends on the underlying problem but may include rest, exercises, medications, injections, or surgery.