The causes of arrhythmia may be physiological or pathological, as follows: 1, physiological arrhythmia: can be seen in adolescent respiratory sinus arrhythmia. 2, pathological arrhythmia: can be seen in patients with atrial fibrillation, ventricular fibrillation, etc., atrial fibrillation can be seen in various types of organic heart disease and hyperthyroidism. Atrial fibrillation can also occur in patients with rheumatic heart disease and heart valve disease. Idiopathic atrial fibrillation can also occur in the elderly, while ventricular fibrillation is common in organic heart disease as well as in severe electrolyte disorders and acid-base imbalances. Ventricular fibrillation is often a malignant arrhythmia that can lead to sudden death events. In conclusion, irregular heartbeats require a systematic approach to their cause.