Purpose: Many available questionnaires fail to distinguish between the severity of symptoms and functional limitations caused by neck pain in different areas. Therefore, determining symptoms and functional limitations that are associated with existing neck pain is difficult. The lack of a specific questionnaire for functional symptoms and constraints related to neck pain in Persian has made it necessary to develop new and reliable tools in this field. Therefore, this research aims to localize and validate the Persian version of this questionnaire. 
Methods: The questionnaire was finalized after necessary corrections were made using the translation back-translation method. The content validity index (CVI) and content validity ratio (CVR) were used to ensure content validity. The internal consistency test (Cronbach α) reliability and test re-test reliability were assessed. 
Results: The CVI results indicated that all questions scored above 0.79 in communication, clarity, simplicity, and ambiguity. The questionnaire demonstrated a high level of content validity with an S-CUI/Ave (scale-level. CVI. based on the average. method) of 0.94. Statistical analysis revealed high internal consistency for the symptoms (27 questions, Cronbach α=0.91) and functional limitations (20 questions, Cronbach α=0.93) sections of the questionnaire.
Conclusion: After conducting the questionnaire, it is possible to identify people with varying levels of pain and functional limitations associated with neck pain. It can help determine the progression of symptoms and limitations.