There is a long tradition among Keats’s critics that links his medical profession to his poetic career, claiming that the former has influenced the latter. Some of them argue that the poet’s medical learning influenced his thought and formed a source material for his poetry. This paper continues this tradition. I argue that Keats’s knowledge of medicine has provided him with technical information to describe abstract states such as negative mood and mental states through medical language. I examine some of his medical metaphors using a cognitive approach to investigate how Keats employs medical terminology to conceptualize these negative mental states. This new approach allows me to see how concepts and structures which belong to the domain...