Heart failure is not contagious, it is not an infectious disease, so you can rest assured. Heart failure, also called heart failure, is a clinical syndrome caused by structural and functional heart diseases. It is caused by various causes of myocardial damage, such as myocardial infarction, myocarditis, cardiomyopathy, and hemodynamic overload, which leads to impaired ventricular filling and ejection function, and finally leads to decreased ventricular pump function, mainly manifesting as dyspnea, weakness, water and sodium retention, etc. Common classifications of heart failure are acute heart failure, chronic heart failure, and according to EF classification, there are heart failure with preserved ejection fraction, heart failure with intermediate ejection fraction, and heart failure with decreased ejection fraction. All heart failure is caused by heart problems, not infectious diseases, and it is not contagious.