Anxiety is the fearful anticipation of further danger or problems accompanied by an intense unpleasant feeling (dysphoria) or physical symptoms. An anxiety disorder differs from normal stress and anxiety.  It is more severe and long-lasting, and interferes with work and relationships.  Anxiety disorders include Generalized Anxiety Disorder, Panic Disorder, Social Phobia, Post-Traumatic Stress Disorder, and Obsessive/Compulsive Disorder.
Psychotic Disorders ,depression, monomanias
Anxiety is not uncommon in children and adolescents.

Separation Anxiety Disorder: Excessive