Enlarged heart shadow is life-threatening because enlarged heart shadow indicates that the heart is very dilated, and once the heart is very dilated, it is very easy to cause heart failure, that is, cardiac insufficiency, and heart failure may be life-threatening at any time. Therefore, if there is an enlarged heart shadow, it is recommended to go to the hospital to determine the cause of the enlarged heart shadow through examination, such as electrocardiogram, cardiac ultrasound, coronary CTA, coronary angiography, through these tests can be clear the primary cause, such as coronary heart disease, hypertensive heart disease, heart valve disease. Finding the primary cause requires active treatment, in terms of treatment there are cardiotonic diuretic, nutritive myocardial treatment, regular re-examination, according to the results of the re-examination to adjust the amount of medication, in order to make the human body to restore health.