Venous thrombosis requires vascular surgery. Venous thrombosis can cause swelling of the distal tissues and occurs in the leg, popliteal or intermuscular veins of the lower extremities, all of which are considered deep vein thrombosis. Venous thrombosis can be detected by ultrasound. If ultrasound does not detect venous thrombosis, venous angiography can be used to observe the situation in the veins. If deep vein thrombosis is detected, the limb should be braked, elevated, and treated with anticoagulants and decongestants, and regular anticoagulation should be administered. After 14 days of bed rest, the thrombus should be moved to the ground because it is relatively strong to the blood vessel and not easy to dislodge and pulmonary embolism.