The purpose of this study was to investigate the relationship between static flexibility of shoulder and shoulder pain in swimmers compared to controls. In order to evaluate the role of the flexibility on shoulder pain in swimmers, 42 competitive age group elite swimmers and 31 age and gender matched nonathletic controls were enrolled in the study. All subjects were requested to complete a questionnaire that provided individual demographics; they were also asked to indicate on a pain scale how much shoulder pain they had felt. To get a total flexibility index, active range of motion of shoulder joint was measured in both dominant and nondominant sides of each subjects. A significant increase in total. flexibility index was seen in swimmers. Swimmers who had shoulder pain had higher value of total flexibility index than those who had no shoulder pain. There was a statistically significant positive correlation between the total flexibility index and shoulder gain in both dominant. and nondominant shoulder of the swimmers (p < 0.05). These findings suggested that excessive shoulder flexibility in swimmers may be one cause of shoulder pain in the swimming athlete.