Right atrial mucinous tumor is a serious condition and should be treated promptly. If it is not treated promptly, it may lead to complications such as heart failure, arterial embolism, and arrhythmia. Right atrial mucinous tumor is a common benign primary cardiac tumor in clinic, and its clinical manifestations are related to the specific location and size of the tumor, the growth rate, the length of the tumor tip, and whether or not dislodgement, hemorrhage, and necrosis occur. With the progression of the disease, patients may develop peripheral edema, ascites, hepatosplenomegaly, jugular vein raging and other symptoms of right heart failure. There is also the possibility of arterial embolism due to tumor or tissue migration to form emboli into the blood vessels. In addition, mucinous tumors can lead to arrhythmias due to abnormal atrial or nerve conduction. Therefore, right atrial mucinous tumor is a serious disease, which should be treated in time and through surgery under the guidance of doctors.