Citizen participation, which gives everyone a greater role in shaping public policy through conventions, online consultations, and collaborative workshops, is gaining momentum across a wide range of fields. This issue of *La Santé en action* explores the various forms of participation in healthcare, which enable people to become more involved in decisions affecting not only their own physical and mental well-being but also that of their community. This engagement offers numerous benefits, both individual and collective: it improves the quality of care, promotes people’s autonomy and empowerment, helps reduce health inequalities, and more. Today, experiential knowledge is increasingly recognized, and citizens are involved in designing health surveys or prevention messages. However, designing health policies not only for populations but with them requires time and resources. And it faces a challenge: how can we ensure effective and inclusive participation?