How can we fight bad information about health? As we continue to face confusing and contradictory misinformation about Covid-19, we have reviewed findings from psychology and health communication to explain how health misinformation travels, and determine what we, and you, can do to fight it. According to the World Health Organization, vaccine hesitancy is one of the world’s top 10 public health risks. In every case, fighting misinformation is a matter of truth and trustHaving the latest medical evidence is only half the fight against health misinformation. Research on everyday health behaviours finds that long-term interventions can improve health-seeking behaviours such as taking up walking, using protection, or accessing quitlines for smokers.