Various studies have shown that some head and neck cancers are strongly associated with specific occupations.  For example, woodworkers in the furniture-building industry are prone to carcinomas of the paranasal sinuses.  Paranasal sinus cancer is rare, but an occupational exposure history is important in patients with recurrent epistaxis, nasal obstruction, or facial pain.  Other occupations with exposures related to head and neck cancer risk include leather manufacturing, nickel refining, textile industry and, historically, radium dial painting.