The function of the heart valves is to control the direction of blood flow and have the effect of preventing backflow of blood. Heart valves are the structures between the atria and the ventricles, or between the ventricles and the arteries, and include the mitral valve, the tricuspid valve, the aortic valve, and the pulmonary valve. During the contraction and diastole of the heart, the heart valves open and close to control the direction of blood flow to the extremities and to ensure that the blood flows in one direction and does not flow back into the heart chambers. Among the heart valves, the most commonly affected is the mitral valve, followed by the aortic valve, such as the common mitral valve closure insufficiency, aortic valve closure insufficiency, aortic valve stenosis and so on. Patients will have different symptomatic manifestations, such as dyspnea, cardiac muscle, at first, chest pain, and fatigue. Therefore, heart valves are very important to the human body, if you have the above mentioned uncomfortable symptoms should promptly seek medical examination.