Swelling of the dorsum of the foot and lower leg can be caused by prolonged upright or sitting position, resulting in poor venous blood return to the distal end, especially in elderly patients. In addition, deep vein thrombosis in the lower extremities, mostly unilateral in the lower extremities, is also associated with intimal damage caused by prolonged weight bearing or trauma. Patients who have hypercoagulable blood and are bedridden for a long time are prone to this complication. Patients will also show pain in the lower limbs, and timely lower limb venous ultrasound and ultrasonography will reveal hypoechoic filling in the venous lumen, which should be treated with anticoagulation in time, and attention should be paid to elevating the limb to prevent the thrombus from dislodging, because it is easy to induce pulmonary embolism, and in serious cases, it is still life threatening. During the treatment period, it is also possible to apply drugs to improve microcirculation and to observe changes in the symptoms and signs of the patient’s lower limbs.