The causes of sudden heart panic and hand trembling are arrhythmias, etc., as follows: I. Arrhythmias: 1. Physiological factors: such as strenuous exercise, emotional excitement, after drinking strong tea, coffee, alcohol and other beverages, can cause arrhythmias and tachycardia; 2. Pathological factors: seen in various types of organic heart disease, for various system diseases outside the circulatory system, such as chronic obstructive pulmonary disease, acute cerebrovascular disease, biliary tract infection, pancreatitis, and gestational hypertensive syndrome can cause tachycardia; 2. Other diseases: hypoglycemic episodes, electrolyte disorders, acid-base imbalance, such as hypokalemia, hyperkalemia, acid-base toxicity, physical and chemical factors, and drug factors can cause tachycardia. In addition, for tachycardia, it is recommended to perform an ambulatory electrocardiogram to clarify the presence or absence of arrhythmias and their types, and give targeted treatment according to the situation.