Cardiac mitral regurgitation is the regurgitation of blood from the left ventricle back into the left atrium when the left ventricle contracts; whether it is serious or not depends on the degree and cause of the mitral regurgitation. When the left ventricle contracts, blood flows from the left ventricle back into the left atrium because the mitral valve does not close completely, which is called mitral regurgitation; when the patient does not have rheumatic heart disease or related valve disease, and only a small amount of mitral regurgitation, it is not serious; if a large amount of regurgitation due to the above mentioned diseases, it is more serious. When there is no organic disease and only a small amount of regurgitation, there are no obvious symptoms, and regular review is recommended; if there is an organic disease, such as rheumatic heart disease, congenital heart valve disease, etc., the primary disease needs to be treated in a timely manner; a large amount of regurgitation can induce heart failure, which requires immediate medical attention and surgical intervention if necessary. When the patient has mitral regurgitation, it is recommended to consult the cardiology department to clarify whether it is accompanied by organic diseases, and to treat it under the guidance of the doctor.