When patients have panic attacks at night, they should consider arrhythmia, insomnia, phytonadic disorders, abnormal thyroid function, anemia, hypokalemia, as follows: 1. Arrhythmia: Consider whether arrhythmia has occurred, for example, patients currently have atrial premature, ventricular premature, or paroxysmal atrial fibrillation, supraventricular tachycardia, which may trigger the feeling of panic. 2. 3. Abnormal thyroid function, anemia, hypokalemia: Some people may have abnormal thyroid function, anemia, hypokalemia, and may feel panic. In order to better clarify the diagnosis, generally speaking, need to combine with further examination, patients can do 24-hour ambulatory electrocardiogram, help to find out in the night panic in the end there is no arrhythmia, can identify what type of arrhythmia, there is also can test the five items of thyroid function, serum ion and blood routine, to see if there is the above considered hyperthyroidism, anemia, hypokalemia problems.