Adolescence is an essential stage of life for developing actions related to health promotion, especially in health education (HE). Public policies advocate for the expansion of participative technologies in this field, as well as different theoretical and methodological perspectives subsidize these. Among these, Paulo Freire's reference guide is practiced in Brazil and around the world. From the Freirean perspective, Thematic Investigation (TI) defines the content of the educational practice. This paper describes a methodological proposal of the Freirean Thematic Investigation for developing health educational practices and promoting health among adolescents. Initially, we describe the conception of the Freirean rationale that sets the grounds for the proposed method: human being, dialogical education and reality and their connections with HE with adolescents in a critical perspective. The methodological proposal is systematized into five stages: (i) Approaching adolescents and the field of educational practices; (ii) Reading reality; (iii) Seminars for analyzing reality reading and preparing the codifications; (iv) Critical analysis of reality; and (v) Planning educational practices. The TI confronts the adult-centric perspectives that characterize adolescent health care. Moreover, as a praxis, TI is a process of reflection and action with adolescents, allowing for not only the discovery of the themes that build educational practices but also for solutions (untested feasibility) for the individual and collective problems experienced by adolescents concerning their health.

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