An intense emotional state caused by specific external stimuli and associated with avoidance, self defense, and escape.

Fear is one of the primary emotions, together with joy, anger, and grief. Fear generally refers to feelings elicited by tangible, realistic dangers, as opposed to anxiety, which often arises out of proportion to the actual threat or danger involved. Fear may be provoked by exposure to traumatic situations, observations of other people exhibiting fear, or the receipt of frightening information. Repeated or prolonged exposure to fear can lead to disorders such as combat fatigue, which is characterized by long-term anxiety and other emotional disturbances.

Fear is accompanied by a series of physiological changes produced by the