The possible consequences of a complete occlusion of the external iliac vein include symptoms such as swelling, numbness and pain in the lower extremities. Complete occlusion of external iliac veins is caused by the external iliac veins containing blood clots, which block the blood vessels for a long time, resulting in poor blood flow in the patient’s external iliac veins. And external iliac vein thrombosis may be caused by excessive obesity and lack of exercise or prolonged sitting and sudden standing. The patient feels localized swelling, and in severe cases, even radiating swelling and pain in the lower limbs and overall edema in the lower limbs. This is due to poor blood flow, resulting in the external iliac vein completely occluded area and its surrounding cells within the waste can not be properly metabolized by the blood, resulting in an imbalance of the surrounding water and electricity balance. And numbness is a sign of ischemia. Due to the complete occlusion of the external iliac vein, patients may experience numbness of the lower limbs, or in severe cases, numbness and insensitivity, or even touch pain and other perceptions are affected, this is due to the complete occlusion of the external iliac vein resulting in insufficient circulation and ischemia of the blood, which seriously affects the patient’s quality of life. Finally, the pain is caused by the poor circulation of blood vessels in the lesion area due to the complete occlusion of the external iliac vein. Prolonged total occlusion of the external iliac veins may cause the patient’s daily activities, such as walking and exercising, to be affected, which can seriously affect the quality of daily life, and should be taken seriously and treated in a timely manner in a hospital.