This book explores rhetorical ethos and its ongoing role in patients’ credibility and in misdiagnoses stemming from gender, race and class-based biases. Drawing on the concept of ethos as a theoretical framework, it explores health and mental illness across different conditions and across different methodological approaches. Extending work on ethos in clinical encounters and public discourse about biomedicine and presenting new research on the rhetoric of mental health, stigma and mental illness, the book explores how bias in clinical settings can lead to symptoms labelled "in the patient’s head" masking treatable medical problems. This notable contribution to the rhetoric of health and medicine will be of interest to all researchers and graduate students of rhetoric and composition studies, rhetoric of health and medicine, disability studies, medical humanities, communication, and psychology.