The cardiovascular surgery department of the hospital has recently admitted three patients with similar symptoms, all of whom came to the hospital with “chest tightness and breathlessness”. Initially, they were thought to be delayed by pulmonary disease at an outside hospital. After routine cardiac ultrasound examinations at the General Hospital, both patients were found to have benign cardiac tumors. Both patients have now undergone surgery in the cardiovascular surgery department. The cardiac mucinous tumors seen intraoperatively were huge, the smallest 6×8×5cm3 and the largest 10×7×7cm3. Both patients had heart tumors that had infiltrated the mitral valve and affected valve function; one of them was more severely affected by multiple cerebral infarctions due to tumor floating down. All of them have successfully removed the tumors and repaired the mitral valve to avoid valve replacement. All three patients are now recovering well. Cardiac tumors can be asymptomatic in their early stages or can present with symptoms similar to other types of heart disease, including life-threatening cardiac dysfunction. Such cardiac dysfunction includes the sudden onset of heart failure, arrhythmias, and a sudden drop in blood pressure due to blood entering the pericardium (the sac that encases the heart). More than half of all primary cardiac tumors are mucinous tumors. 3/4 of all mucinous tumors occur in the left atrium. Mucinous tumors in the left atrium are usually tipped and oscillate like a ball of string within the atrium in response to blood flow. They can move around the mitral valve or continuously block the mitral orifice, resulting in intermittent blockage of blood flow. Because gravity can cause the tumor to fall into the open mitral orifice, patients with mucinous tumors may experience syncope, shortness of breath, and pulmonary congestion in the standing position. Symptoms may be relieved in the recumbent position. Fragments of mucinous tumor or blood clot on the surface of the mucinous tumor may be dislodged and travel with the blood to tissues and organs throughout the body, resulting in embolization of small vessels in these areas. Symptoms depend on the location of the embolism, such as stroke due to embolism of a blood vessel in the brain or chest pain and hemoptysis due to embolism of a blood vessel in the lungs. Other symptoms of mucinous tumors include fever, weight loss, Raynaud’s phenomenon (pain and tingling of finger or toe tips when the upper and lower extremities are exposed to cold), anemia, decreased platelet count, and symptoms suggestive of severe infection. The tumor can also cause mitral valve damage and mitral valve closure insufficiency. These diseases have a certain incidence in the population and should be detected early. Both patients had been delayed out of hospital for almost half a year since the onset of symptoms, and the estimated history of tumor was more than 1 year. Early detection of cardiac tumors and annual cardiac ultrasonography is essential. If detected early, timely surgery can avoid many of the complications mentioned above, and the impact on the normal structure of the heart is not significant, and the surgery can avoid valve molding, valve replacement, etc. Echocardiography is indicated for almost all people suffering from cardiovascular diseases. In patients with hypertension, echocardiography can detect septal thickening and left ventricular diastolic function to determine whether hypertensive heart disease is combined; in patients with coronary artery disease, echocardiography can detect local abnormalities in ventricular wall activity; in patients with atrial fibrillation, echocardiography can clarify the size of the left atrium and the presence of intracardiac thrombus, and evaluate the feasibility of rhythm conversion and the risk of cardiovascular events; in patients with myocarditis, echocardiography can provide early detection of the presence of myocarditis. Echocardiography in patients with myocarditis can detect abnormal regurgitation of intracardiac blood flow as early as possible; echocardiography in patients with cardiomyopathy can detect the size and thickness of the heart and abnormalities of the endocardium and clarify the diagnosis; echocardiography in patients with heart failure can clarify the systolic function of the left ventricle and guide the selection of clinical cardiotonic drugs; echocardiography in patients with rheumatic heart disease can clarify the thickness, mobility, and orifice opening area of the affected valves and guide the selection of valvular balloons. In patients with rheumatic heart disease, echocardiography can clarify the thickness, activity and open area of the affected valves and guide the valve balloon expansion or valve replacement; in patients with congenital heart disease, echocardiography can detect the abnormal anatomical structures of the heart and abnormal shunts of intracardiac blood flow, clarify the diagnosis of the disease and provide important reference for future interventional or open-heart surgery. Since cardiac echocardiography is safe, non-invasive and repeatable, it is now used clinically as an important tool for diagnosing and identifying cardiovascular system diseases. For elderly comrades, regular annual examination of cardiac ultrasound is of great significance for the evaluation of cardiac function and early detection of cardiac diseases.