Overview

A varicocele (VAR-ih-koe-seel) is an enlargement of the veins within the loose bag of skin that holds your testicles (scrotum). A varicocele is similar to a varicose vein that can occur in your leg.

Varicoceles are a common cause of low sperm production and decreased sperm quality, which can cause infertility. However, not all varicoceles affect sperm production. Varicoceles can also cause testicles to fail to develop normally or shrink.

Most varicoceles develop over time. Fortunately, most varicoceles are easy to diagnose and many don't need treatment. If a varicocele causes symptoms, it often can be repaired surgically.

Symptoms

A varicocele often produces no signs or symptoms. Rarely, it may cause pain. The pain may:

  • Vary from sharp to dull discomfort
  • Increase with standing or physical exertion, especially over long periods
  • Worsen over the course of a day
  • Be relieved when you lie on your back

With time, varicoceles may enlarge and become more noticeable. In young men, the presence of a varicocele impairs sperm production and can often be improved with treatment.

When to see a doctor

Because a varicocele usually causes no symptoms, it often requires no treatment. Varicoceles may be discovered during a fertility evaluation or a routine physical exam.

However, if you experience pain or swelling in your scrotum, discover a mass on your scrotum, notice that your testicles are different sizes, or develop a varicocele in your youth, or you're having problems with fertility, contact your doctor. A number of conditions can cause a scrotal mass or testicular pain, some of which require immediate treatment.

Causes

Your spermatic cord carries blood to and from your testicles. It's not certain what causes varicoceles. However, many experts believe a varicocele forms when the valves inside the veins in the cord prevent your blood from flowing properly. The resulting backup causes the veins to widen (dilate). This may then result in damage to the testicle and result in worsened fertility.

Varicoceles often form during puberty. Varicoceles usually occur on the left side, most likely because of the position of the left testicular vein. However, a varicocele in one testicle can affect sperm production in both testicles.

Risk factors

There don't appear to be any significant risk factors for developing a varicocele. However, some research suggests that being overweight may reduce your risk while being taller may increase the risk.

Complications

A varicocele may cause

  • Shrinkage of the affected testicle (atrophy). The bulk of the testicle comprises sperm-producing tubules. When damaged, as from varicocele, the testicle shrinks and softens. It's not clear what causes the testicle to shrink, but the malfunctioning valves allow blood to pool in the veins, which can result in increased pressure in the veins and exposure to toxins in the blood that may cause testicular damage.
  • Infertility. Varicoceles may keep the local temperature in or around the testicle too high, affecting sperm formation, movement (motility) and function.

Varicocele care at Mayo Clinic

Nov. 11, 2017
References
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