For some years, the multi-dimensional perspective on migration and health issues has lead to grasp these phenomena in a broad way and to regard them as societal dynamics of the differentiation of life worlds. This sensitivity to differentiate not only implies different cultural ways of living, but also a differentiation of social rights affiliations, as exemplified by the discussion on health services for illegal workers. In order to give the proper answer to a specific problem, the challenge for our societies will be to deal with these differences and to grasp them as something normal.