Background: Work-related musculoskeletal disorders (WMSDs) mainly caused by awkward postures, manual lifting and carrying the load, repetitive movements and lack of appropriate
work station design. To identify the prevalence rate of work-related musculoskeletal disorders in auto parts-manufacturing plants’ workers, this study was conducted.

  Method: In a cross-sectional study, we calculated the prevalence rate of WMSDs in 1383 workers of two largest auto parts-manufacturing plants, using Nordic questionnaire in Iran .

  Result: According to the results, 81.2% of the workers mentioned that they have experienced musculoskeletal disorders at least in one of their nine body regions during last year. The most common body regions affected were lower back (61.8%), hand and wrist (59.2%) and elbow (48.7%), respectively.

  Conclusion: Results of this study show that the prevalence rate of WMSDs is very high in workers studied. Therefore, for improving working conditions, it is necessary to set ergonomics preventive programs and workplaces design.