Typically, lower extremity venous thrombosis is in remission after three years and is usually not risky with active treatment, but it can still be dangerous if the patient doesn’t pay attention to his or her condition. Lower extremity venous thrombosis is a condition in which blood clots in the veins of the lower extremities. Lower extremity venous thrombosis can occur again if the patient has been bedridden for a long period of time with little activity in the lower extremities, if the blood is sticky and has not been treated with antithrombotic medication, or if the blood vessel has been damaged by a vascular puncture. Dislodgement of the newly generated thrombus may lead to fatal pulmonary embolism. If the patient actively cooperates with the doctor for the relevant surgery and other treatments and regular review, and anticoagulation treatment at a later stage, the relative risk is reduced after three years. Lower extremity venous thrombosis patients should pay attention to the postoperative maintenance work, pay attention to bed rest, pay attention to warmth, prohibit strenuous physical activities, maintain mental relaxation, which is conducive to the recovery of the condition.