This guide addresses possible somatic differential diagnoses through numerous clinical case reports and is therefore ideally suited for the multidisciplinary treatment team of mentally ill children and adolescents. Due to the complexity and interdisciplinary nature of the conditions, it is often challenging to assess the various aspects of mental illnesses on one side and physical illnesses on the other. The book is aimed at child and adolescent psychiatrists, child and adolescent psychotherapists, occupational therapists, physiotherapists, art therapists, and anyone working with mentally ill children and adolescents. Additionally, the book is also useful for pediatricians who want to consider differential diagnostic thoughts regarding psychological symptoms. Emphasis has been placed on considering both the psychological and somatic aspects.