The length of life expectancy for arrhythmias varies from person to person. Functional arrhythmias do not affect life expectancy, while organic arrhythmias have different prognoses depending on the specific cause, and death can occur within a short period of time in severe cases. Arrhythmias refer to abnormalities in the site of origin, frequency, rhythm, conduction velocity, and sequence of excitation of cardiac impulses. Functional arrhythmias, including dysfunction of the vegetative nervous system, electrolyte or endocrine system disorders, have no organic damage and do not affect life expectancy. In contrast, organic diseases require a prognosis based on the disease, and the length of life depends on the type of arrhythmia, clinical symptoms, and whether it is combined with underlying disease. For example, in patients with severe heart failure combined with arrhythmias, the patient’s expected survival may be around 5-15 years after active treatment is given. In addition, patients can die suddenly of cardiac origin at any time due to complications such as acute left heart failure, malignant arrhythmias, and thromboembolism. Patients with arrhythmias, without undue concern, should actively seek medical attention and clarify the nature of the disease through relevant tests.