In the context of the relationship between science and solidarity in nursing, I affirm that solidarity and social integration should be main purposes of scientific knowledge and research. To this end, I develop a reflection about concepts and experiences in five parts. In the first, I propose a concept of nursing care understood as interaction and coordination of actions with the people with whom we work; this in order to highlight a nursing care aimed at social integration. Then, I reconstruct the concepts of social solidarity and social integration proposed by Jürgen Habermas. Then, assuming that diversity and power are forces that affect solidarity and social integration, I analyze the close relationship between truth and power from Michel Foucault and highlight the role that medical anthropology and transcultural nursing have played as interpreters of the diversity. In the next part, I narrate some experience son research and intervention that we have been doing with children experiencing parental migration in Colombia which articulate the elements discussed in the previous parts. Finally, I raise some ideas on how I think our research can and should contribute to solidarity and social integration.