Cardiac auscultation is one of the most important aspects of cardiac system examination. The stethoscope is placed in the precordial region to listen to the heartbeat to understand the status of the heart, which plays a very important role in cardiac examination. Cardiac auscultation includes listening to the heart rhythm, heart sounds, pericardial friction sounds, and heart murmurs. Under normal circumstances, patients will show changes in heart rate or patients will show different changes in heart sounds, such as augmentation of heart sounds, diminution of heart sounds, and alternating changes in heart sound sex. If there are obvious heart problems, there will also be murmurs of different degrees, and the nature of the murmur is often jet-like, sigh-like, blowing-like, rumbling-like, mechanical-like changes, etc. Therefore, it is perfectly possible to hear some heart problems with a stethoscope. However, after auscultation, some auxiliary tests should be performed to further clarify the underlying cause of the heart problem.