This book provides a definitive account of koro, a topic of long-standing interest in the field of cultural psychiatry in which the patient displays a fear of the genitals shrinking and retracting. Written by Professor A.N. Chowdhury, a leading expert in the field, it provides a comprehensive overview of the cultural, historical and clinical significance of the condition that includes both cutting-edge critique and an analysis of research and accounts from the previous 120 years published literature. The book begins by outlining the definition, etymology of the term, and clinical features of koro as a culture-bound syndrome, and contextualizes the concept with reference to its historical origins and local experience in Southeast Asia, and its subsequent widespread occurrence in South Asia. It also critically examines the concept of culture-bound disorder and the development of the terminology, such as cultural concepts of distress, which is the term that is currently used in the DSM-5.