With a particular focus on the experience of young people in higher education, this paper turns to the philosophical work of Cora Diamond to open up new ways of conceptualising mental health. We claim that Diamond offers a compelling insight into that experience of human "difficulty" so often subsumed by a medicalised vocabulary. We propose that she offers philosophically astute perceptions of the related human attempts at "deflection" (as when those same difficulties are avoided because of their lack of fit with the established discourse). And we situate this reading of Diamond against a broader understanding of the contemporary university as a place of institutional "darkness." In developing this general discussion, we place ourselves within a very particular context. We draw on the narratives of a number of third-level students in Ireland, who shared their experiences as part of a hermeneutic phenomenological study into the lived experience of mental health difficulties.