Tests such as cardiac enzymes, troponin, electrocardiogram, echocardiogram, coronary CT, and cardiac MRI are required to check for heart disease. Coronary angiography can also be done in difficult cases considering coronary artery disease. ECG: ECG is the most common test, including general ECG, ambulatory ECG, and plate exercise test. ECG has very definite value for arrhythmia and conduction disorders, acute myocardial ischemia and myocardial infarction, etc. Echocardiography: Also called cardiac ultrasound, it can measure heart size, myocardial thickness, valve morphology, blood flow, and pericardial status, and can be used to screen for heart disease with changes in heart morphology or structure, such as valve disease, precordial disease, pulmonary heart disease, hypertensive heart disease, and other diseases. Coronary CT examination: Coronary CT is a CT scan performed after contrast is injected into the body to perform three-dimensional reconstruction of the coronary arteries, which is highly accurate for diagnostic screening of coronary heart disease. Cardiac magnetic resonance examination: It is more accurate for the examination of large blood vessel diseases of the heart. In addition, certain heart diseases have special examination items, such as myocardial enzymes and troponin for patients suspected of myocardial infarction. Coronary angiography can also be performed for difficult cases of coronary artery disease. If heart failure is suspected, cardiac function measurement, blood brain natriuretic peptide test, etc. can be done.