This study reports on a corpus analysis of a one million word collection of adolescent health emails submitted to an online health forum, the Teenage Health Freak, a UK-based website which provides evidence-based health advice and information for young people. The corpus approach to linguistic analysis integrates both quantitative and qualitative techniques, affording a reliable means of identifying trends and patterns of communication. By examining the common ways in which adolescents construct their health concerns to professionals online, this study aims to describe commonalities in young people's accounts of health, specifically sexual and mental health, thereby giving voice to an age group whose subjective experiences of health and illness nave often been overlooked in favour of older generations.