Generalized Anxiety Disorder (GAD) is defined as excessive and unrealistic worry about everyday life events lasting at least six months, with various classifications including panic disorders and social phobia. Common symptoms include persistent anxiety, difficulty concentrating, and physical signs like fatigue and muscle tension, with risk factors including personality traits, genetics, and traumatic experiences. Treatment options involve medications such as benzodiazepines and antidepressants, as well as therapies like cognitive behavioral therapy and relaxation techniques.