The most commonly affected valve in rheumatic heart disease is the mitral valve, accounting for about 70% of cases, which can lead to mitral stenosis or closure insufficiency. Rheumatic heart disease is a disease that occurs when the heart is affected by infection with Streptococcus B hemolyticus. The most commonly affected heart valve is the mitral valve, which accounts for about 70% of cases, and the tricuspid valve is involved in about 25% of cases. When the mitral valve is involved, mitral valve insufficiency or mitral stenosis results, and patients often present with Mild mitral valve involvement can be treated conservatively by treating the cause of the disease, usually with penicillin for anti-infective therapy, aspirin for anti-inflammatory therapy, and diuretics such as hydrochlorothiazide for diuresis when the patient is in heart failure. Severe mitral valve involvement requires surgery for valve repair or replacement of the prosthetic valve. Rheumatic heart disease requires early treatment in order to obtain a good prognosis, should go to the regular hospital as soon as possible.