One type of anxiety disorder with sudden onset of somatic symptoms is called panic disorder. Like other anxiety disorders, the main symptoms often vary from person to person, such as sudden onset of palpitations, chest pain, gagging, dizziness and a sense of unreality (depersonalization and dissolution of reality), often followed by a fear of imminent death, loss of control or madness. The annual prevalence of panic disorder in the general population is 1.3% in men and about 3.2% in women. Patients with this disorder are often admitted to the hospital in an emergency accompanied by their families, and then discharged because the exact illness cannot be identified or after simple medical treatment, and repeat the experience when the symptoms reoccur. Repeated physical examinations and treatments increase unnecessary medical expenses and also increase the psychological burden of patients, leading to more psychological problems.