Introduction The nature of the environment in which people live is characterized with extremely high levels of uncertainties about future events. While people often anticipate good things to happen in their lives, there is always an almost established fact that bad things are also most likely to be experienced. These expectations form the basis of anxiety in people that defines a sense of worry or an uneasy feeling due to unascertained phenomenon that are always expected to happen. Though some impacts of anxiety are normal, there are some that are realized to have adverse effects and end up being termed as disorders. This paper seeks to discuss anxiety disorders in children and adolescents. The paper will look into anxiety disorder with respect to its causes, prevalence, classification, progression and treatment among other aspects. Anxiety Disorders Impacts of anxiety with respect to either good or bad occurrences are under normal circumstances understood as normal reactions to whatever is expected to happen. An anticipation of a negative happening is however in most cases realized to have an induced level of fear or even stress to an individual. When a negative expectation results in an extreme negative reaction in terms of fear and worry then it is classified as an anxiety disorder. The definition of anxiety disorder thus distinguishes it from normal anticipations that may not enlist any form of worry to an individual. Instances such as anxieties following anticipation for an appointment are for example considered to be normal in adults while a child who is being taken away from home to attend school may be extremely scared at the fact that he or she is going to be separated from the mother or whoever was closely taking care of him or her. The disorders are further identified when the individuals get extremely fearful while there is actually no solid reason to develop such fears. A child who is being taken to school for example develops fears while he or she is going to be securely brought back home. Instances of young children who are actually in perfect health conditions developing extreme fears of suffering from diseases such as cardio vascular complications or even cancer when they absolutely have no symptoms or reasons for such fears also forms basis for anxiety disorders among children and adolescents. Though anxiety disorders were not anciently considered by professionals, attention has currently been devoted to it to realize that a significant numbers of the young generation are victims. It was, for instance, realized by the year 2008 that teenagers are almost constantly under anxiety disorder complications with either subsequent or even simultaneous cases of disorders by an individual (Chandler, n.d.). Causes of Anxiety Disorders Factors that cause anxiety disorders have not individually been identified with specific disorders that are realized. These factors have at the same time not been agreed upon by experts as to their exact impacts on anxiety disorders. Causes of the disorders are however postulated to range from “biological, psychological to social factors” (Bernstain, 2010, p. 476). The factors may individually or in combination result in any particular or groups of anxiety disorders. Biological factors as identified with anxiety disorders are associated with t