The most common cause of cardiac distension is myocardial ischemia, which can be caused by a variety of diseases or states. Diseases including coronary artery disease, myocarditis, cardiomyopathy, valvular disease, wind heart disease, and pulmonary heart disease can all lead to myocardial ischemia. The basic etiology of myocardial ischemia is atherosclerosis of coronary arteries, coronary artery myocardial bridges, coronary artery spasm, and other factors. Acute myocardial ischemic events often occur under the action of related triggers, including exertion, exercise, satiety, cold, emotional excitement, etc. For cardiac distension, systematic related examinations, including cardiac enzymes, electrocardiogram, cardiac ultrasound, and coronary artery imaging, are needed to clarify its basic etiology and give corresponding treatment.