This essay provides a comprehensive analysis of anxiety disorders in adults aged 25-65. It begins with an introduction to anxiety, defining the disorder and highlighting its prevalence, with statistics from various global and national surveys. The essay then delves into the causes of anxiety, utilizing a biopsychosocial model to explore biological, psychological, and social/environmental factors. It examines the effects of anxiety on normal life functioning, including behavior, cognition, mood, physical health, and social interactions. The second part focuses on Cognitive Behavioral Therapy (CBT) as a therapeutic approach, explaining its principles, methods, and effectiveness. The essay also discusses the role of nurses in managing anxiety patients, emphasizing the importance of communication and emotional intelligence. The essay concludes by summarizing the key points and reiterating the significance of understanding and addressing anxiety disorders in adults.