Mild mitral valve insufficiency may be caused by enlargement of the heart, rheumatic heart disease, and structural abnormalities of the valve. 1. Enlarged heart: When the heart is enlarged, the mitral valve tissue may not change accordingly, and relative mitral valve insufficiency may occur. 2. Rheumatic heart disease: When rheumatic heart disease occurs, it may lead to lesions of the mitral valve tissue, and then there will also be a mild mitral valve insufficiency. 3. Structural abnormalities of the valve: due to congenital developmental abnormalities of the mitral valve, it may also lead to mild mitral valve insufficiency causing regurgitation of blood. There are many reasons for mitral valve mild closure insufficiency. In this case, you can consult a doctor for a heart ultrasound examination to make a clear diagnosis, so that the mitral valve mild closure insufficiency situation can be improved. If there is no combination of other heart diseases, mild mitral valve insufficiency has little effect on heart function, and the cardiac ultrasound can be repeated regularly on an outpatient basis, so that timely consultation can be made when the insufficiency worsens.