Abstract
The tenderness in wrist, lower arm, shoulder, upper back and low back are often caused by chronic muskuloskeletal disorder of the whole body or the part of the body, it is an important cause of morbidity and absenteeism in the occupational environment. So we decide to study this problem among 2034 workers of assembly line in six different industries (car, clothing, machinery, electronic, computer and post office) and 580 workers selected from a control group who worked in the same factories with equivalent activities. The results of this study showed that the percentage on tenderness in the parts of the body mentioned above increase with the adding of the workers age; In general, the percentage on tenderness of workers with ≥35 age group always keep the highest level.
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