Heart murmurs have certain hazards, first of all, it is clear which kind of heart disease is causing the heart murmur. Generally, the heart murmur can be caused by the following types of diseases: 1, heart valve disease. For this type of patients, the prognosis should be assessed according to the severity of valve stenosis and regurgitation. If the stenosis or regurgitation is moderate or severe or more, the patient is advised to undergo valve replacement as soon as possible. If the stenosis or regurgitation is only mild or even moderate, the patient can be under close clinical observation for the time being.2. Congenital heart disease. If the patient is found to have atrial septal defect, ventricular septal defect, patent ductus arteriosus, and other congenital heart diseases by cardiac ultrasound, it is recommended to give interventional blockage or surgical repair as soon as possible. 3. Hypertrophic obstructive cardiomyopathy, which is mainly caused by structural abnormalities such as outflow tract stenosis and other heart murmurs, should be given different treatments according to different etiologies.