<unk> <unk>  can be attributed to one or more of the following factors: * Congenital abnormalities are frequently found in persons with<unk> . These include cervical rib, prolonged transverse process, and muscular abnormalities (e.g., in the scalenus anterior muscle, a sickle-shaped scalenus medius) or fibrous connective tissue anomalies. * Trauma (e.g., whiplash injuries) or repetitive strain is frequently implicated. * Rarer acquired causes include tumors (especially pancoast tumor), hyperostosis, and osteomyelitis
Thoracic outlet syndrome
Fibromyalgia
Central cord syndrome
Rotator cuff tear
Medial medullary syndrome
Complex regional pain syndrome
Cervical spinal stenosis
Multiple sclerosis