Today, well-known figures—artists, athletes, influencers—publicly share their mental health struggles. This shows just how far we’ve come over the decades, when the “madman” was confined to the walls of psychiatric hospitals or kept hidden within families. This special report from *La Santé en action* sheds light on this major shift: mental health is no longer merely the absence of mental disorders; it is a broader concept that encompasses everyone’s emotional, psychological, and social well-being. This dynamic state is influenced throughout life by multiple social, economic, and cultural factors. To improve the mental health of the population—the deterioration of which the COVID-19 pandemic has revealed—it is important to address these determinants proactively through intersectoral public policies. This issue explores possible paths toward collective transformation—whether it involves creating cities that foster the well-being of their residents, workplaces where employees can thrive, or schools where young people feel comfortable and are eager to learn. Furthermore, initiatives and tools exist to ensure that everyone is able to take care of their mental health, just as they do their physical health.