Cardiac arrhythmias are abnormalities in the frequency, rhythm, site of origin, conduction velocity and order of excitation of heart impulses. Normal cardiac excitation originates in the sinus node of the heart, which is the highest “command” of cardiac pacing. The “commands” from the “command” are transmitted to the atria and ventricles in a certain order and time, and excite the corresponding parts of the heart. If there is any abnormality in the origin, autoregulation, conduction sequence or conduction speed of the heart excitation, it can cause a change in the normal rhythm of the heart, resulting in arrhythmia. The possibility of arrhythmia occurs at every moment of a person’s life, from the beginning of fetal life to the end of life. The incidence of arrhythmias in newborns during the first week of life has been reported to be 0.7% of hospitalized newborns during the same period. The most common arrhythmias include supraventricular tachycardia, atrial flutter, atrial fibrillation, premature beats, and conduction block, which means that arrhythmias do not only occur in adults, but also in newborns, infants, and children. Therefore, it is important for fathers and mothers of children to be aware of this. The incidence of arrhythmias in the middle-aged population is very high. The electrocardiograms of 3494 cases of middle-aged people were analyzed and found that 790 men had arrhythmias and 335 women had arrhythmias. The average age was 47.5 years and the incidence of arrhythmias was 32.2%. The types of arrhythmias include premature beats, atrial fibrillation, atrioventricular block, bundle branch block, pre-excitation syndrome, junctional rhythm, sinus bradycardia, sinus tachycardia, etc. Since the heart function of the elderly has declined, they are vulnerable to various damages, especially from heart diseases. Therefore, the incidence of arrhythmia in the elderly is very high, and it is reported that the incidence of arrhythmia in the elderly is as high as 44.48%. The prevention and treatment of heart disease and other diseases in the elderly is especially important to reduce the occurrence of arrhythmias.