With regard to how long a patient with venous thrombosis can live, it is important to first clarify where the venous thrombosis is present. In general, venous thrombosis exists in the lower extremities. The formation of deep vein thrombosis in the lower extremities does not affect the patient’s life, although it can cause obstruction of venous blood return, resulting in swelling of the legs, varicose veins in the superficial veins, and aggravation when moving. If treated promptly and effectively, the patient’s symptoms will be relieved. If a thrombus is dislodged and causes embolism of the pulmonary artery, a small pulmonary embolism is not seriously life-threatening, but if it blocks the main trunk of the pulmonary artery and seriously affects the formation of arterial blood, it can endanger the patient’s life and may lead to sudden death. Therefore, the appearance of lower limb venous thrombosis must be actively treated formally. Early detection, early diagnosis and early treatment, the better the prognosis of the patient will be.