Palpitations are an uncomfortable feeling of heartbeat, often used as a synonym for panic, often accompanied by discomfort in the precordial region. It belongs to the category of “Palpitation” and “Stunned” in Chinese medicine. Patients often use the words “heart panic”, “heart jumping” or “heart jumping” to describe it, which is actually caused by changes in the frequency and rhythm of the heartbeat or the strength of the heart contraction. 1. Causes 1. Cardiovascular diseases Commonly found in various types of heart disease, such as myocarditis, cardiomyopathy, pericarditis, arrhythmia and hypertension. Chen Kai, Department of Internal Medicine, Tianchang People’s Hospital 2, non-cardiovascular diseases Commonly seen in diseases such as anemia, hypoglycemia, massive blood loss, hyperthermia, hyperthyroidism, and pleural effusion, pneumothorax, pulmonary inflammation, pulmonary atelectasis, ascites, intestinal obstruction, intestinal distension, etc.; also seen in palpitations after the application of epinephrine, isoprenaline, aminophylline, atropine and other drugs. 3, neurological factors Autonomic (plant nerve) dysfunction is the most common, neurasthenia, menopause syndrome, panic or overexcitement, after strenuous exercise can appear palpitations. Second, the classification of arrhythmia normal heart rhythm originated from the sinus node, the frequency of 60 times to 100 times / min (adults), relatively regular. The sinus node impulses excite the atria and ventricles sequentially through the normal atrioventricular conduction system, and the conduction time is constant (0.12-1.21 seconds in adults); the conduction time of the impulses reaching the ventricular muscle through the bundle branch and its branches and Purkinje fibers is also constant