The mitral valve auscultation zone is at the apical pulsation, at the place where the apical pulsation is strongest. The heart is a blood pump and it has several valves that produce a vibrating sound when the valves close, so the normal mitral auscultation zone sound is the sound of the valves closing. If the patient has other sounds in the mitral valve auscultation area, there is a murmur, it is likely that the valve is not closed, cannot be closed or the door cannot be opened, or the patient may have a hole in the heart structure and other problems, so it will produce a murmur. The murmur is divided into physiological murmur and pathological murmur, such as excitement, alcohol consumption, hyperthyroidism after the emergence of a strong, rapid heartbeat and other circumstances leading to the emergence of physiological murmur, more than no clinical significance, does not require treatment. Pathological murmurs, such as a door that does not close tightly, does not open, or a ruptured tendon that pulls on the door, are recommended to have a cardiac ultrasound examination to clarify the diagnosis.