Cardiac enlargement, dilated cardiomyopathy, or in medicine called dilated cardiomyopathy, is a disease of the heart muscle, usually starting from the heart's main pumping chamber, the left ventricle, losing its firm elastic structure. The disease may initially cause no symptoms, but once symptoms are present, they progress rapidly, have a severe prognosis, and eventually lead to potentially life-threatening events.

I went to Japan for a health check. When I took an X-ray, the doctor said my heart was enlarged in the left part. If you are active, you will die suddenly. But I don't have anything unusual or uncomfortable at all, very normal.