What age is considered as the early onset of anxiety disorders? What are the criteria for phobia? What is the definition of obsession in obsessive-compulsive disorder?

General considerations for anxiety disorders  Often have an early onset- teens or early twenties  Show 2:1 female predominance  Have a waxing and waning course over lifetime  Similar to major depression and chronic diseases such as diabetes in functional impairment and decreased quality of life Anxiety disorders  Specific phobia  Social anxiety disorder (SAD)  Panic disorder (PD)  Agoraphobia  Generalized anxiety disorder (GAD)  Anxiety Disorder due to a General Medical Condition  Substance-Induced Anxiety Disorder  Anxiety Disorder NOS Specific Phobia  Marked or persistent fear (>6 months) that is excessive or unreasonable cued by the presence or anticipation of a specifi