Recent statistics found the prevalence of dyslexia in UK medical schools to be 7%, sitting below the national prevalence of 10%. The factors contributing to this discrepancy are currently unknown, but may result from an interplay of individual and systemic barriers to entering medicine. This collaborative, analytic autoethnography aimed to use the experiences of 'Meg', a fourth-year medical student who was diagnosed as dyslexic whilst at medical school, to explore how the lack of a diagnosis during the admissions process may have impacted her journey into medicine. The data were collected using reflective writing and an interview before conducting a thematic analysis. Our analysis resulted in the construction of two meta-themes, relating to the negative emotional impact of not having a diagnosis and feelings of inferiority. Seven themes were also constructed. Some explored how Meg's personal experience of undiagnosed dyslexia acted as a barrier to entering medicine. Others explored the impact of external factors, such as socio-economic background and the provision of support, on an individual's chance of successfully applying to medical school. Finally, we explored the inadvertent impact undiagnosed (and unrecognised) dyslexia had on Meg's life course, including how medicine-specific aptitude tests, such as the BMAT and UKCAT, may have contributed to this. These results provide a unique window into the culture of applying to medical school as an undiagnosed dyslexic person, whilst discussing the need for medical schools to consider how their admissions processes may inadvertently disadvantage undiagnosed dyslexic applicants.