In recent years much health research across the social sciences and humanities has undergone a noticeable, albeit by no means cohesive or comprehensive, 'turn' towards a posthumanist theoretical orientation. This paper reviews the radical ideas about health's emergence that have accompanied this turn, noting the core processes that are understood to always be in play. In particular, while acknowledging that not all humanistic ideas have been rejected in this work, it describes how some have been reworked and extended in 'other-than-fully conscious' and 'more-than-human' terms. The paper assesses and synthesizes this diverse literature, emphasising the novel understandings of corporeality, materiality, assemblage, relationality, vitality and affect that have become distinctive features of it.