Occupational diseases cause an important burden on health and economy; however, they are substantially underestimated. We aimed to investigate the opinions of physicians about causes of underreporting of occupational diseases. We collected data with a questionnaire, listing 30 possible causes for underreporting of occupational diseases. 478 physicians participated in the study. The first 3 most frequent causes perceived as "very important" are; employers' perception of occupational safety and health services as a loss of revenue (64.9%), prevalent employment without a legal contract (64.6%), and prevalent employment as subcontracted (59.4%). 52.1% of the physicians worked or currently working as an occupational physician. With the increase of working year as an occupational physician, there was a statistically significant decrease in the strength of importance for 17 of the 30 statements. This finding may be one of the important causes of underreporting of occupational diseases.
Keywords: Occupational diseases; notification; occupational physicians; underreporting.