Fear is considered a basic healthy emotion induced by a threat which causes a change in the brain and organ function and ultimately a change in behavior . However, there exists destructive properties of excess fear. This destructive value of fear has been observed in animals and human models of psychopathology. This excess fear can be categorized as pathological fear when exaggerated behavioural and automatic responses are observed. This happens when fear circuits of the brain have become hyper-excitable, the core of abnormality in most disorders of fear and anxiety. Anxiety is the conscious way of expressing fear and they are often mistaken for each other. Nevertheless, neurobiology of fear is different than neurobiology of anxiety. Although
