Shoulder disorders refer to a range of conditions that affect the shoulder joint, including pain, stiffness, and limited mobility. Common types include rotator cuff injuries, tendinitis, and frozen shoulder. These disorders can result from overuse, injury, or age-related wear and tear. Symptoms often include pain during movement, swelling, and difficulty lifting the arm. Diagnosis typically involves a physical examination and imaging tests like X-rays or MRI. Treatment options may include rest, physical therapy, medications, or in some cases, surgery to restore function and alleviate pain.