Panic disorder, also known as panic attack, typically presents with recurrent unpredictable and sudden feelings of tension, fear, and dread, accompanied by a sense of near death and loss of control, and physical manifestations of muscle tension and fidgeting, often accompanied by sweating, chest tightness, chest pain, palpitations, dyspnea, and other symptoms of autonomic dysfunction. The attack usually lasts for 20-30 minutes, but rarely more than an hour. Patients often feel that they are dying when they have an attack and will call 120 to go to the emergency room, and the examination is basically normal. Between attacks there is often a fear of recurrence, when the anxiety experience is no longer prominent and is represented by weakness. 60% of patients have persistent anxiety and concern about having another attack, and can have behavioral changes associated with the attack, such as avoidance of work or school, and some patients can have symptoms of depression or suicidal tendencies. If panic attacks occur, a visit to a psychiatric outpatient clinic is required.