Mitral regurgitation is a condition in which blood from the left ventricle flows backward into the left atrium because of damage to the mitral valve due to various causes. In normal human blood circulation, the left atrium ejects blood to the left ventricle, and then ejects blood to the whole body through the aorta, and the mitral valve is the “valve” between the left atrium and the left ventricle. When the left atrium ejects blood to the left ventricle, the mitral valve opens, and the mitral valve closes insufficiently, which can lead to the backflow of the left ventricle’s blood to the left atrium. Mild degrees usually have no obvious symptoms and do not require treatment; regular follow-up is sufficient. Mitral regurgitation is a common clinical manifestation of the disease. Once it occurs, it should be treated in a timely manner in a hospital under the guidance of a professional doctor.