The spermatic veins run along the spermatic cord and are usually not palpable on the surface of the body. The spermatic vein is the male reproductive vein that travels up from the testes through the spermatic cord in the inguinal region and gradually joins the renal vein in the retroperitoneum. The reason why spermatic veins are clinically important is that varicocele can lead to a decrease in sperm quality and cause infertility. Under normal circumstances, the spermatic veins are not accessible. When the spermatic veins are varicose, the blood vessels are tortuous and blood stagnation can be seen on the surface of the scrotum as tortuous and dilated vessels. Because the spermatic veins converge at right angles to the left renal vein on the left side, they need to overcome gravity to allow blood to return, and therefore, varicose veins are more common on the left side of the spermatic cord in clinical practice. Varicocele is common in young men, mostly due to frequent sexual impulses. In mild cases, varicose veins have no clinical symptoms and are mostly undetectable. Therefore, premarital screening is clinically recommended for early detection of the problem and timely treatment is recommended once varicocele occurs to avoid infertility. As mentioned above, the spermatic vein travels along the spermatic cord, from the testes to the groin and gradually upward through the posterior abdominal cavity to join the renal vein, which is inaccessible to the normal human body.