Several occupational exposures have been classified as definite or probable human carcinogens (cancer-causing substances). Occupational cancer is cancer that is caused wholly or partly by exposure to a carcinogen at work. Workers employed in certain types of jobs are more likely to develop particular cancers. Examples of occupational cancers include carcinoma, mesothelioma, and sinonasal and nasopharyngeal cancer.
The most common types of occupational cancers are lung cancer, bladder cancer and mesothelioma (cancer of the lining of the lungs and chest wall). Reducing exposure will reduce the risk of developing cancer from a carcinogen.