Panic disorder can occur with or without agoraphobia being present.
A panic attack is an episode of extreme anxiety that includes a specific pattern of symptoms associated with extreme physiological arousal. There may be heart palpitations, trembling or shaking. The person may feel dizzy, may sweat profusely, have hot flashes, or experience numbness in the extremities. The person may also experience shortness of breath. There may be a feeling of unreality, or being detached from oneself.