Role of the spermatic veins: Collect blood from the testes and epididymis into the inferior vena cava. Causes of varicocele: Abnormal function of the valves in the spermatic veins that prevent venous blood from flowing back. Clinical manifestations of varicose veins: discomfort of the scrotum and varicose veins in the scrotum, mostly on the left side. Hazards of varicose veins: In mild cases, it causes discomfort in the scrotum, and in severe cases, it leads to male infertility with abnormal sperm. Treatment of varicose veins: 1. Conservative medical treatment such as wearing tight pants can relieve clinical symptoms, but cannot be cured. 2.Surgical ligation of the spermatic vein, which requires anesthesia and incision of the skin, causing great damage and high cost. 3, interventional embolization, simple operation, fast recovery, low cost, is the preferred treatment.