We report a case of carpal tunnel syndrome which occurred in a office secretary, whose job task was mainly type writing. Occupational origin of this disease was stressed based on unilateral lesion, absence of personal and familial risk factors. Working conditions seem to explain the occurrence of symptoms. The recognition of occupational origin is important for physicians, because it eases the implementation of ergonomic sound measures which supply medical treatment. It also allows to take into account medico-legal aspects.