The causative agent of subacute infective endocarditis is Streptococcus streptococcus. In the presence of subacute infective endocarditis, patients may have high fever and chest discomfort such as chest tightness, dyspnea, decreased activity tolerance, and the appearance of skin rashes and nodules on the body. Once the diagnosis of infective endocarditis is confirmed, blood analysis and blood cultures, plus drug sensitivity testing, are needed to determine the current extent of infection and the infecting organism. In addition, antibiotics that are sensitive to the bacteria can be measured. For general treatment, 4-6 weeks of anti-inflammatory therapy is required. At the same time, cardiac strengthening, diuretic and myocardial nutrition treatments need to be given so that together, the body can achieve the goal of recovery.