Population Health Research Brief Series

Abstract

Political polarization poses considerable risks to well-being. Both ideological polarization (“extremification” of policy positions and ideological orientations) and affective polarization (out-party hate) have increased over the past several decades with detrimental effects on public health. This brief summarizes the impacts of political polarization on public health in the U.S., highlighting the COVID-19 pandemic as a case study on the health risks of polarization. The authors show that, in the United States, one of the strongest predictors of COVID-19 prevention behaviors, such as social distancing and vaccination, was political partisanship. Gaps in these behaviors between Republicans and Democrats increased over the course of the pandemic, despite the increasing evidence about the health risks. The authors provide suggestions for how public health leaders can regain and sustain trust to reduce the harms of political polarization.