Cardiac insufficiency is medically referred to as heart failure, which has many possible causes related to myocardial damage, increased cardiac afterload, and insufficient ventricular preload. 1. Myocardial damage: heart failure is a variety of cardiac structural or functional diseases resulting in impaired ventricular filling and (or) ejection function, cardiac blood displacement can not meet the body’s tissue metabolic needs. Diseases that cause myocardial damage can cause heart failure, such as coronary artery disease leading to ischemic myocardial damage such as myocardial infarction, chronic myocardial ischemia; myocarditis; dilated cardiomyopathy; hypertrophic cardiomyopathy and so on. 2. Increased cardiac afterload: hypertension, aortic stenosis, pulmonary hypertension, pulmonary valve stenosis and other diseases can make the left and right ventricle systolic ejection resistance increase, thus causing heart failure. 3. Insufficient ventricular preload: diseases such as mitral stenosis, cardiac tamponade, restrictive cardiomyopathy, and constrictive pericarditis can cause limited ventricular filling, which can result in stagnation of the body and pulmonary circulation and cause heart failure. When the patient has heart failure, it is recommended to consult the regular hospital in time, improve the relevant examination, clarify the cause of the disease, and timely treatment to avoid delaying the condition.