Dr. Stacy McBroom
Dr. John Upshaw
Infinite Menus, Copyright 2006, OpenCube Inc. All Rights Reserved.



Varicocele is a mass of enlarged veins that develops in the spermatic cord, which leads from the testes (testicles) up through the inguinal canal (passageway in the lower abdominal wall) to the circulatory system. The spermatic cord is made up of blood vessels, lymphatic vessels, nerves, and the vas deferens (duct that carries sperm from the body). If the valves that regulate bloodflow from these veins become defective, blood does not circulate out of the testicles efficiently, which causes swelling in the veins above and behind the testicles.

A varicocele can develop in one testicle or both, but in about 85% of cases it develops in the left testicle. The left spermatic vein drains into the renal vein between the superior mesenteric artery and the aorta; these two arteries can compress the renal vein and thus impede bloodflow from the spermatic vein. The right spermatic vein drains into the vena cava (the vein that returns blood to the heart) and develops varicocele less often. A unilateral (one-sided) varicocele can affect either testicle.

Because of the impaired circulation of blood created by a varicocele, the blood does not cool as it does in a normal vein. The increased temperature of the blood raises the temperature of the testes, which is believed to contribute to infertility, as heat can damage or destroy sperm. The raised temperature may also impede production of new, healthy sperm.

Incidence and Prevalence

Incidence of varicocele is 10-20% and is highest in men between the ages of 15 and 25. The sudden appearance of varicocele in an older man may indicate a renal tumor blocking the spermatic vein.

Approximately 40% of infertile men have a varicocele and among men with secondary infertility those who have fathered a child but are no longer able to do so prevalence may be as high as 80%.


A varicocele develops when the valve that regulates bloodflow from the vein into the main circulatory system becomes damaged or defective. Inefficient blood flow causes dilation (enlargement) of the vein.

Signs and Symptoms

Most men who have a varicocele have no symptoms. Asymptomatic (symptom-free) cases are often diagnosed during a routine physical examination. Signs and symptoms may include the following:

  • Ache in the testicle
  • Atrophy (shrinkage) of the testicle(s)
  • Feeling of heaviness in the testicle(s)
  • Infertility
  • Palpably (evident to the touch) enlarged vein
  • Visibly enlarged vein

Recurrent or constant discomfort or pain in the genital region should be reported to a urologist or primary care physician to determine the cause.