Uncertainty has a bad reputation in risk communication. It tends to be associated with error, incompetence or uselessness. On the other hand, certainty, expert knowledge, authority are thought to be the basis of trust. Yet, it is in times of uncertainty that trust should be inducing preparedness behaviors. How should communicators convey uncertainty and maintain trust? This study attempted to decipher the complex relationships between uncertainty, trust, search for information sources and preparedness behaviors. Data from 2223 participants to a representative national survey of risk perception in Canada was examined through cluster analysis and segmented regression analyses to identify different patterns of behaviors according to level of reported uncertainty and sense of trust in various sources of information. Additionally, three case studies compared perceived risk from either natural disaster, or from radiation, or from vaccination. The dependent variables included search for information, discussion, planning, having an emergency kit, intent to evacuate, or receiving vaccines. Results demonstrated similar patterns across hazards. We found interaction effects suggesting that under higher uncertainty perceived benevolence of information source was a significant predictor of preparedness behaviors. It also showed that uncertainty was associated with more discussions with others, which in turn predicted better preparedness. On the opposite, uncertainty coupled with untrusted sources of information was associated to avoidance and sense of helplessness. In general, findings supported the need for a reframing of communicating risk uncertainty in public messaging. It suggested the value of providing a more explanatory, empowering and caring content. Fostering deliberation about preventive coping is discussed in a new paradigm of shared governance of risk management in public health and public safety. It calls for more transparency and more proactive anticipation, sharing earlier preliminary information, and engaging more readily in discussions. It also repositions science as an investigative process, not just a knowledge base.