This book offers a comprehensive and in-depth examination of foreign language anxiety, grounded in a wide range of empirical research. It addresses key issues central to the study of language anxiety and presents the most effective and commonly used research methodologies for investigating these domains. Each topic is explored thoroughly through both a synthesis of existing studies and the inclusion of a carefully designed exemplar study that employs appropriate qualitative and/or quantitative methods. Importantly, the book bridges theory and practice: each chapter concludes with a section dedicated to pedagogical implications, translating research insights into actionable strategies for foreign language teaching and learning.