This document discusses how politics relates to public health. It provides four key reasons why public health is inherently political: 1) Individual health actions can create externalities that affect others, requiring some level of political oversight. 2) There is debate around what basic health services governments should provide as "merit goods". 3) Moral views on public health issues require political support to enact policies. 4) Large public health problems could threaten national security if left unaddressed. The document explores these concepts through examples like infectious disease outbreaks and different countries' welfare systems.