Traumatic/Acute:
Shoulder Dislocation
Anterior shoulder dislocation
Posterior shoulder dislocation
Inferior shoulder dislocation
Clavicle fracture
Humerus fracture
Scapula fracture
Acromioclavicular joint injury
Glenohumeral instability
Rotator cuff tear
Biceps tendon rupture
Triceps tendon rupture
Septic joint
Anterior shoulder dislocation
Posterior shoulder dislocation
Inferior shoulder dislocation
Nontraumatic/Chronic:
Rotator cuff tear
Impingement syndrome<unk> 
Adhesive capsulitis
Biceps<unk> 
Subacromial bursitis
Cervical radiculopathy
Refered pain & non-orthopedic causes:
Referred pain from
Neck
Diaphragm (e.g. gallbladder disease)
Brachial plexus injury
Rucksack paralysis
Axillary artery thrombosis
Thoracic outlet syndrome
Subclavian steal syndrome
Pancoast tumor
Myocardial infarction
Pneumonia
Pulmonary embolism
Neck
Diaphragm (e.g. gallbladder disease)
Rucksack paralysis
Calcific tendinitis
Traumatic/Acute:
Calcaneal bursitis
Shoulder Dislocation
Pes anserine bursitis
Anterior shoulder dislocation
Hip bursitis
Posterior shoulder dislocation