Common diseases of paroxysmal ventricular tachycardia include coronary artery disease, ischemic cardiomyopathy, acute myocardial infarction, hypokalemia, heart enlargement caused by various types of cardiomyopathy, heart failure, QT interval prolongation syndrome, and pulmonary heart disease caused by chronic obstructive pulmonary disease. Congenital heart disease, such as atrial septal defect, ventricular septal defect, tetralogy of Fallot, etc. causing heart enlargement, etc., can occur paroxysmal ventricular tachycardia. Paroxysmal ventricular tachycardia can also occur with digitalis and quinidine poisoning. Ventricular tachycardia is a malignant arrhythmia that can be life-threatening if left untreated. If ventricular tachycardia is detected on ECG, it is important to find the cause and take timely treatment measures.