The higher the level of heart murmur is not necessarily more serious. Heart murmur is a kind of extra heart sound outside the normal sound, there are physiological and pathological murmurs, divided into six levels, three levels of physiological murmurs, more than three levels of pathological murmurs, the higher the level of the heart murmur is not necessarily the more serious the condition, the degree of heart murmur grading and the severity of the condition is not entirely proportional. For example, in patients with pulmonary stenosis, the higher the heart murmur level, the more serious the condition. Severe mitral stenosis patients, due to the local valve stenosis is too serious, resulting in the left atrium to the left ventricle blood flow decreased significantly, the murmur is not obvious, but the condition is more serious. If you hear a murmur of grade 3 or higher during a heart examination, a cardiac ultrasound should be done to clarify whether the heart problem is serious, and whether there is any defect or valve damage, and then target treatment.