Purpose: Thoracic outlet syndrome is one of the most controversial topics in clinical medicinedue to its difficult assessment and management. The appropriate treatment depends on accurateand comprehensive assessment. This study aimed to review the current assessments of thesepatients.Methods: This study was conducted by review of the articles published between 1990 and2014. Search was conducted by keywords such as assessment, evaluation, outcome measure, tool, thoracic outlet syndrome, non-surgical treatments, conservative, and rehabilitation. In thisregard, internal and external databases, including PubMed, OVID, ProQuest, Web of science, Elsevier, OT seeker, SID, Magiran, Iran Medex, Medlib, and Google scholar were used.Results: The results showed that the most common assessments for these patients in a clinicaland research setting included a thorough review of history and subjective evaluation. No specifictools were found for patients with thoracic outlet syndrome but 5 generic outcome measureswere suggested to measure the outcome of interventions in these patients.Conclusion: At present, comprehensive evaluation of patients with thoracic outlet syndromeneeds different assessments and using the generic questionnaire that is designed for people withorthopedic conditions. Therefore, a comprehensive assessment tool with a holistic view andspecific for patients with thoracic outlet syndrome is necessary.