As part of its mission to conduct epidemiological surveillance of occupational risks, Santé publique France is implementing, in collaboration with the Medical Labor Inspection (IMT) of the Ministry of Labor and the regional observatories of participating regions, a system for the epidemiological surveillance of work-related diseases (MCP). The program relies on the voluntary participation of occupational physicians and collaborating physicians in the region, who, over two consecutive weeks known as "MCP Fortnights," report all MCPs encountered during their consultations with workers, with the support of nurses. This brochure presents the results of the only two-week period conducted in 2021 in the Hauts-de-France region.