Shoulder pain

DDx

• Rotator cuff tendinitis ("impingement") or tear
• Subacromial bursitis
• Biceps tendinitis
• Osteoarthritis (acromioclavicular joint; rare in glenohumeral joint)
• Frozen shoulder (adhesive capsulitis)
• Acromioclavicular (AC) separation
• Neck disorder, eg, osteoarthritis, herniated disk, tumor
• Rheumatoid or septic arthritis
• Calcific tendinitis
• Shoulder dislocation or fracture
• Avascular necrosis
• Polymyalgia rheumatica
• Fibromyalgia
• Thoracic outlet syndrome
• Brachial plexus neuropathy
• Referred pain from gallbladder, heart, diaphragm, Pancoast tumor
• Metastatic or primary tumor