Anxiety and fear, originally instinctive for human survival, often become uncontrollable psychological constraints in modern society. From pre-exam restlessness to extreme avoidance of social situations, from inexplicable palpitations and panic to a morbid fear of specific things, these emotions not only plague hundreds of millions of people worldwide but also permeate every aspect of life—physical, psychological, and social. This book, from a scientific perspective, deconstructs the nature of anxiety and fear, from its neural mechanisms to its impact on social functioning, and from the plight of specific populations from children to the elderly, to solutions ranging from professional treatment to self-adjustment. It aims to provide readers with a comprehensive guide to understanding, coping with, and overcoming these emotional barriers, enabling anyone struggling with anxiety to find a path forward.