Book excerpt: The need for policy coherence between trade and health has never been greater, yet few public health workers are equipped to navigate this complex field. This book aims to fill this gap, providing a focused and readable introduction to the topic. It introduces the principles underpinning trade treaties and examines the implications of trade rules for health services and access to medicines, unhealthy commodities, labour rights and the environment. It explores the trade policy making process, methods for trade and health research, and recommendations for strengthening policy coherence.