When the tricuspid valve cannot be completely closed during systole due to congenital or acquired factors causing tricuspid valve disease or tricuspid valve ring dilation, it is called tricuspid regurgitation. There are two types of this disease: functional and organic. The former is mostly secondary to lesions that cause right ventricular dilatation, and the incidence rate is quite high, such as primary pulmonary hypertension, mitral valve disease, pulmonary valve or infundibulum stenosis, right ventricular myocardial infarction, etc. The latter can be congenital abnormalities such as Ebstein's malformation and common atrioventricular channel, or acquired lesions such as rheumatic inflammation, coronary artery disease causing tricuspid papillary muscle insufficiency, trauma and infective endocarditis. The prognosis of this disease depends on the nature of the primary cause and the severity of heart failure. The prognosis of patients caused by primary pulmonary hypertension and chronic cor pulmonale is often worse than that caused by mitral valve disease or atrial septal defect. Medical treatment can relieve symptoms, and surgery can cure the disease.