This chapter investigates how different types of global challenges affect public perceptions of the European Union across six member states—France, Germany, Italy, Poland, Spain, and Sweden—by applying an original interpretive framework that classifies such challenges by their pace, scope, and political resonance. Drawing on Eurobarometer data and original post-electoral survey data, it explores how acute disruptions tend to generate short-term surges in support, while gradual and transnational threats foster more diffuse, norm-based pro-EU orientations. In contrast, recurrent issues with strong identity implications—such as immigration—consistently fuel Eurosceptic sentiment. The chapter highlights the mediating role of national political cultures, media framing, and institutional legacies in shaping how citizens interpret global challenges and attribute responsibility to the EU. Rather than reinforcing uniform dynamics of integration, these challenges trigger context-specific reactions that reshape how the EU’s legitimacy and capacity to manage uncertainty are perceived in an era of polycrisis.