Patients with hypertrophic cardiomyopathy are auscultated mainly for the presence or absence of a fourth heart sound and heart murmur. In patients with hypertrophic cardiomyopathy, due to ventricular outflow tract obstruction, ventricular diastolic function is reduced, so the presence of the fourth heart sound at the end of ventricular diastole contraction is helpful in diagnosing hypertrophic cardiomyopathy. In terms of cardiac murmurs, patients with outflow tract obstruction can hear a rough jet systolic murmur at the 3rd-4th intercostal space on the left edge of the sternum, which is a specific murmur for hypertrophic cardiomyopathy and has some diagnostic significance. In addition, a systolic murmur can be heard in the apical region because in patients with hypertrophic cardiomyopathy, ventricular contraction causes forward motion of the mitral valve, resulting in a cardiac murmur similar to mitral valve insufficiency.