Anxiety is a feeling experienced when a person is too concerned about the possibility of frightening events that occur in the future that can not be controlled, and if it happens to be rated as "terrible" (Sivalitar, 2007).
1. Psychoanalytic Theory
According to Freud, personality structure consists of three elements, namely id, ego and super-ego. Id symbolizes encouragement primitive instincts and impulses, super ego reflects a person's conscience and controlled by one's cultural norms, while the ego is described as a mediator between the demands of the id and super-ego. Anxiety is an emotional conflict between the id and super-ego that serves to warn the ego of a hazard that needs to be addressed.
2. Interpersonal Theory
Anxiety occurs from the fear of interpersonal rejection, it is also associated with trauma in infancy, such as loss, separation which causes a person to become harmless. Individuals who have low self esteem is usually very easy to experience anxiety.
3. Behavior Theory
Anxiety is the result of frustration from everything that impairs the ability of a person to achieve the desired goals experts consider the behavior of anxiety is a learned impulse by impulse, the desire to avoid pain. This theory believes that humans are at the beginning kehidupanya faced with excessive fear will show the possibility of severe anxiety in severe life and the lives of adulthood.
4. Biological Theory
According to WB Cannon center in the brain thought to have an important effect on emotional problems is the hypothalamus reticular activation system (RAS) and the limbic system. The function of the reticular activating system is to prepare the areas in the brain to stimuli that would come. The limbic system is the part of the brain that is viceral brain (the brain) as a union, integrity and receive impulses from the organ. Impulse and viceral can get to the cortex through the limbic system. One aspect that is important in the distribution of impulse is catecholamines Neurotransmitter substances are not homogeneously dispersed throughout the brain but concentrate on certain parts of the brain.
