Arrhythmia is an abnormality in the frequency, rhythm, site of origin, conduction velocity, or order of excitation of the heart impulses. Causes include primary and acquired, and treatments include drugs, intervention, and surgery. 1. The causes of arrhythmia are mainly categorized into primary and acquired. (1) Primary arrhythmias include long QT interval syndrome, short QT interval syndrome, catecholamine-sensitive ventricular tachycardia, and early repolarization syndrome. (2) Acquired includes physiologic and pathologic factors, such as exercise, emotional changes, sleep; pathologic factors, such as various organic heart disease (e.g., coronary artery disease), drug toxicity, acid-base imbalance and electrolyte disorders of various causes, and lesions of organs other than the heart (e.g., hyperthyroidism). 2. Treatment mainly includes drug therapy, interventional therapy and surgery. (1) Drug therapy: choose the appropriate drug according to the type of arrhythmia, e.g. lidocaine for ventricular arrhythmia. (2) Interventional therapy: electrical cardioversion. (3) Surgical treatment: implantable cardioverter-defibrillator, catheter radiofrequency ablation. When an arrhythmia occurs, you should choose to go to the hospital and be treated under the guidance of your doctor.