Loneliness in Older Adults: Effects, Prevention, and Treatment analyzes loneliness as a complex phenomenon, taking into account the most recent contributions from neuroscience, psychology, medicine and sociology. This volume describes this phenomenon from an interdisciplinary point of view, with special emphasis on older people from a plural and heterogeneous perspective: older people in general, older immigrants, older women, older LGTBI, etc. Faced with the impact of this emerging issue, this book provides a comprehensive knowledge of loneliness, contributing scientific knowledge to the practice of evidence. Tools are also provided for professionals, providing intervention protocols with debates and proposals, and effective digital resources to combat it. Tables, images, and tools guide students, academics, and professionals step-by-step in solving the cases raised, through an integrated practice. There is no work that develops this theme from such a plural and pragmatic perspective, covering all the dimensions of loneliness in each of the thematic axes: psychological, neurological, social, and health. Readers are provided feedback for all the knowledge for a comprehensive scientific knowledge based on evidence and given the necessary instrumental skills related to being social and the functioning of our brain. This book is aimed at a very plural audience of researchers, academics and professionals in the social and behavioral sciences including psychologists, sociologists, social workers, anthropologists, and also professionals in the health sciences, among others.