‘But this is a wizardry something that has to be removed first’

In Nigeria, diagnoses of schizophrenia and descriptions of its symptoms and experiences are shaped by numerous biomedical and sociocultural perspectives. However, although many studies have focused on the social realities and public attitudes towards the disorder, the interactional means of how its diagnoses and experiences are constituted in psychiatric interviews have not hitherto received close attention from linguists in Nigeria. This paper thus examines a corpus of 56 audio recorded interviews in mental health clinics in southwestern Nigeria, using insights from Arundale’s concept of communicating and relating and Stalnaker’s notion of common ground. It observes that diagnoses of the disorder do not subscribe to any rigid diagnostic pathways, but evolve from the relational, provisional and operative interpretation of the design of its experiences and other shared contextual situations that collectively instantiate the knowledge of mental illness in Nigeria.