This book raises questions about the changing relationships between technology, people and health. It examines the accelerating pace of technological development and a general shift to personalized, patient-led medicine. Such relationships are increasingly mediated through particular medical technologies, drawn together by the authors as 'personal medical devices' (PMDs) – devices that are attached to, worn by, interacted with, or carried by individuals for the purposes of generating biomedical data and carrying out medical interventions on the person concerned. The burgeoning PMD field is advancing rapidly across multiple domains and disciplines – so rapidly that conceptual and empirical research and thinking around PMDs, and their clinical, social and philosophical implications, often lag behind new technical developments and medical interventions. This timely and original volume explores the significant and under-researched impact of personal medical devices on contemporary understandings of health and illness. It will be a valuable read for scholars and practitioners of medicine, health, science and technology and social science.