This book is a comprehensive and practical guide for mental health professionals and trainees seeking to understand and treat separation anxiety across the lifespan. It provides an in-depth examination of separation anxiety and separation anxiety disorder, integrating theoretical foundations with clinical application. Emphasizing evidence-based practice, the text explores how separation anxiety presents in diverse populations and contexts, including cultural influences and co-occurring conditions. Through case examples and structured interventions, the book equips clinicians with effective tools to assess, conceptualize, and treat separation anxiety in children, adolescents, and adults. Key Features Comprehensive overview of separation anxiety characteristics, diagnosis, and etiology Detailed coverage of assessment strategies and evidence-based interventions Practical modular treatment approaches tailored for families of young children Guidance on medication management alongside psychosocial interventions Dedicated chapters addressing separation anxiety in: Children affected by trauma Foster care populations Children with chronic medical conditions Children on the autism spectrum Specialized chapter on separation anxiety in adults, including presentation and treatment Consideration of cultural factors influencing symptom expression and treatment Use of case studies to illustrate real-world clinical applications