Heart failure is a syndrome that occurs when various structural or functional cardiac diseases impair ventricular filling or ejection function. Once heart failure occurs, medical treatment should be sought promptly. Common causes of heart failure mainly include the following points. The first category is primary myocardial damage, which mainly includes coronary heart disease, myocardial infarction, myocarditis, cardiomyopathy, and diabetic cardiomyopathy, among others. The second major category is cardiac load, such as excessive pressure load, commonly seen in hypertension, aortic valve stenosis, pulmonary hypertension, etc.; and excessive volume load, mainly found in cardiac valve insufficiency and congenital heart disease, among others.