The heart does not beat fast, but the patient still has symptoms of panic. This situation may be due to the patient’s coronary artery blood vessels have more serious narrowing, or there is a certain degree of myocardial blood supply is insufficient. In other cases, there may be a disorder in the regulation of the vegetative nervous system, cardiac neurosis, or other psychosomatic disorders, and the person may experience panic attacks, but there is no abnormality in his or her heart. Others may be due to the presence of hypothyroidism, hyperthyroidism, which is now well corrected, but still feel a kind of panic attack from time to time. Although the heartbeat is not that fast and there may be a certain amount of bradycardia present, still feeling panicky has some correlation with the production of thyroid hormone levels.