Fear and stress reactions are essential for human survival. They enable people to pursue important goals and to respond appropriately to danger. In a healthy individual, the stress response is provoked by a genuine threat or challenge and is used as a spur for appropriate action.
An anxiety disorder, however, involves an excessive or inappropriate state of arousal characterized by feelings of apprehension, uncertainty, or fear. The anxiety response is often not triggered by a real threat. Nevertheless it can still paralyze the individual into inaction or withdrawal. An anxiety disorder persists, while an appropriate response to a threat resolves, once the threat is removed.
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