Rucksack paralysis
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
Calcific tendinitis
Adhesive capsulitis
Biceps tendinitis
Subacromial bursitis
Cervical radiculopathy
Refered pain & non-orthopedic causes:
Referred pain from
Neck
Diaphragm (e.g. gallbladder disease)<unk> 
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
Carpal tunnel syndrome
Pronator teres syndrome
Anterior interosseous neuropathy
Ulnar neuropathy
Radial neuropathy at the spiral groove (ie. "Saturday night palsy")
Posterior interosseous neuropathy
Suprascapular neuropathy
Long thoracic neuropathy
Axillary neuropathy
Spinal accessory neuropathy
Musculocutaneous neuropathy<unk>  plexopathy
Parsonage-Turner syndrome
Cervical radiculopathy
Parsonage-Turner syndrome
Brachial plexus injury
Rucksack paralysis
Anterior cord syndrome
Traumatic/Acute:
Third nerve palsy
Shoulder Dislocation
Spinal cord injury
Anterior shoulder dislocation