The main feature of Generalized Anxiety Disorder is excessive, unrealistic and uncontrollable worry about everyday events. This constant worry affects daily functioning and brings physical symptoms. GAD can occur with other anxiety disorders, depressive disorders, or substance abuse. It can be misdiagnosed because it lacks some of the dramatic symptoms, such as unprovoked attacks of panic, that are seen with other anxiety disorders. For a diagnosis to be made, uncontrollable worrying occur more days than not for at least 6 months.