The Clinical Handbook of Fear and Anxiety: Maintenance Processes and Treatment Mechanisms offers a comprehensive guide to understanding and treating clinical anxiety and related disorders. Edited by Jonathan S. Abramowitz PhD, this first edition delves into the complexities of diagnosing anxiety, revealing that clear distinctions between DSM and ICD diagnoses are often illusory in practice due to overlapping symptoms among different diagnoses. This shift in perspective is reflected in the book’s structure: Part I focuses on key psychological processes such as intolerance of uncertainty and threat overestimation, which maintain clinical anxiety across various presentations. In Part II, contributors explore empirically supported mechanisms of change like exposure therapy, cognitive restructuring, and acceptance-based interventions, demonstrating their effectiveness across a range of anxiety disorders. The transdiagnostic approach advocated by the editors bridges theoretical knowledge with practical treatment strategies, making this handbook an invaluable resource for clinicians seeking to enhance their understanding and application of evidence-based practices in mental health care.