Inferior vena cava thrombus of liver cancer will usually not have specific symptoms, but will increase the risk of portal hypertension. The presence of inferior vena cava embolus in liver cancer indicates that the prognosis of the patient is not good, and the patient is prone to metastasis and proliferation or even has already metastasized, which will increase the incidence of portal hypertension, and at the same time, ruptured varicose veins of esophagus and fundus of the stomach may also be present, but the patient usually does not have specific symptoms. In addition, once the cancerous thrombus of inferior vena cava dislodges and enters into organs such as lungs or heart, it may cause acute complications such as pulmonary embolism and acute cardiac arrest, which is life-threatening. Therefore, it is recommended that patients who find cancerous thrombus in inferior vena cava should consult the doctor in time for effective treatment to control the progress of the disease.