The most common cause of subacute infective endocarditis is embolism of various organs due to dislodgment of the flab, which may lead to death of the patient. In subacute infective endocarditis, the main manifestation is the formation of redundant valves, which, depending on the severity of the disease, can cause embolism in other organs, such as cerebral embolism, pulmonary embolism, and kidney embolism, if they are dislodged. Once embolism will lead to interruption of blood flow, ischemia, hypoxia and necrosis of corresponding organs, which will seriously endanger human health. Therefore, once the diagnosis of subacute infective endocarditis is confirmed, anti-inflammatory or even surgical treatment should be actively given to ensure the health of the human body.