This paper explores the lived experience of university students with dyslexia, focusing on identity and self-esteem. The qualitative study used semi-structured interviews with five students with dyslexia and discussions with learning support tutors at four UK universities. Thematic analysis of the interview data revealed the impact of dyslexia's stigma on students' academic self-concept and self-efficacy in their studies, including how students manage stigma through decisions on when and with whom to declare dyslexia: some even rejected study support. Concealing dyslexia led to identity conflict and low self-esteem, compounding students' already low academic self-concept, particularly when dyslexia had been unrecognised through school. The study highlights significant academic, practical and identity consequences for students who hide dyslexia from their peers, subject lecturers or study support. The conclusions outline priorities to lessen dyslexia's stigma at university, increase student agency in their support and open dialogue on dyslexia, particularly important between students with dyslexia and subject lecturers. By exploring dyslexia's identity impacts and disclosure, this paper contributes to wider conversations on increasing the representation, achievement and retention of students with dyslexia.