This master s thesis aims to present a preliminary analysis of the causes that fuel political-ideological conflicts, using as one of the main theoretical bases the studies of the social psychologist Jonathan Haidt, among other relevant theoretical approaches. The objective is to identify whether these causes can explain the level of polarization presented in the 2018 elections in Brazil, clarifying the general causes of human behavior that lead to polarization, such as the reasons that lead humans to join groups and enter into conflicts, as well as identifying the specific causes of conflicts between right and left, objectively delimiting their differences and incompatibilities. To achieve this objective, it was necessary to survey theories from various areas of knowledge, such as Social Psychology, Evolutionary Biology, Moral Philosophy, and Social Sciences. Preliminary conclusions indicate that there are evolutionary and innate factors that guide the division of groups and that the causes of ideological conflicts are related to the difficulty of dialogue and consensus due to divergent worldviews and moral foundations. The Brazilian polarization seen in the 2018 presidential elections was a political-ideological polarization. Thus, the theoretical survey presented in this work can serve as a basis for a more in-depth empirical analysis of the subject.