Faced with a growing population of immigrant workers during the "glorious thirties" period, the doctors in charge of their health in the construction industry began to inquire about their specific risks and medical problems at work from the middle of the fifties. These questions were a part of a wider range of professional reflections oriented toward social analysis of occupational health in the construction industry within the larger landscape of post-war occupational health in France. Thanks to the organization of important national surveys whose data were electronically used since the 1970s, construction industry doctors could answer questions concerning the particular characters of migrants’ health in workplaces without any racial bias. From that moment, ways of life, eating, place of work, and difficulty of tasks took their full place in medical analysis on accidents, inaptitude, or professional diseases of migrant workers.