A heart murmur is a systolic or diastolic murmur that the doctor hears in the valve auscultation area of the heart, and a murmur does not necessarily mean that the patient has symptoms. The murmur only means that the heart valves may be stenotic or not closing properly. Whether the heart valve stenosis or insufficiency, in the absence of a certain degree of development, does not affect the function of the heart, does not cause heart failure, does not cause arrhythmia, the patient is generally not symptomatic. The presence of congenital heart disease and heart valve disease may be life-threatening, such as severe ventricular septal defect or arterial duct failure and severe mitral stenosis or mitral valve insufficiency, which can cause heart enlargement, recurrent heart failure, or malignant arrhythmias that can lead to sudden death. If you hear a heart murmur, it is recommended that the patient should actively undergo a cardiac ultrasound examination, cardiac ultrasound can understand the opening and closing of the valves, whether the valves are closed insufficiently or stenosis, and even understand the cause of the valve lesions, and understand the patient’s cardiac function, so as to better carry out the corresponding treatment.