Small amounts of mitral and tricuspid regurgitation are present in many normal people and continued observation is sufficient. If discomfort occurs, consider the association with rheumatic heart disease, congenital anomalies, endocarditis, pulmonary heart disease, pulmonary hypertension, and other causes. 1. Physiological phenomenon: a small amount of mitral valve, tricuspid valve regurgitation exists in many normal people, if there is no discomfort, and the test indicators are normal, continue to observe. 2. Mitral valve insufficiency: Studies have shown that there are many reasons for mitral valve insufficiency. If it is chronic insufficiency, it is considered that it may be caused by rheumatic heart disease, congenital anomalies, connective tissue disease, dilated cardiomyopathy, hypertrophic cardiomyopathy and other reasons. If the closure is acute or subacute, it may be caused by infective endocarditis or trauma. 3. Tricuspid valve insufficiency: the common causes of this disease include pulmonary heart disease, pulmonary hypertension, rheumatic heart disease and congenital heart disease, etc. Rare causes of this disease include tricuspid valve prolapse and coronary heart disease. When patients experience discomfort, they need to actively cooperate with doctors for treatment and strengthen daily life management.