Varicocele and Male Fertility

If you’ve been diagnosed with varicoceles, and you spend the next day researching the condition on the internet, you will find wildly conflicting narratives regarding its effect on fertility. You may encounter claims that it's the leading cause of male infertility and should be fixed immediately, while at the same time be told it doesn't matter because plenty of men with varicoceles have children naturally.

Both claims are true to a certain extent.

A varicocele is simply a collection of enlarged veins around the testicle, somewhat like varicose veins, but in the scrotum. Around one in seven men develop one but never know it's there. Most are often discovered during an examination for infertility or scrotal discomfort. Many men with a varicocele have no symptoms and are able to father children naturally. However, in some cases, a varicocele may affect sperm production and fertility.

Understanding when a varicocele is likely to matter—and when treatment may be beneficial—requires looking at the whole clinical picture rather than the presence of the varicocele alone.

Why do varicoceles occur?

A varicocele develops when the veins that drain blood from the testicle become enlarged because blood flows backwards instead of returning efficiently towards the heart. This most commonly affects the left side due to the way the veins are arranged anatomically. In some men, increased pressure in the left renal vein, sometimes called the nutcracker phenomenon, can contribute to the development of a varicocele or make it more pronounced.

How can a varicocele affect fertility?

How can a venous problem affect fertility?

Researchers believe that several factors may contribute to reduced sperm quality in some men with a varicocele.

Blood pooling around the testicle can raise its temperature, reduce oxygen delivery, and increase oxidative stress. Those highly reactive molecules begin damaging the cells responsible for making sperm. Together, these changes may interfere with normal sperm production. Studies have also shown that oxidative stress can damage sperm DNA, which may affect fertility even when a standard semen analysis appears normal.

Not every man with a varicocele experiences these changes, which is why the impact on fertility varies considerably from person to person.

Does the size of the varicocele matter?

Varicoceles are usually classified according to what can be felt during a physical examination.

• Subclinical: Seen only on ultrasound.
• Grade I: Felt only during straining (Valsalva manoeuvre).
• Grade II: Felt while standing at rest.
• Grade III: Large enough to be visible through the skin.

Although grading helps describe the varicocele, it does not reliably predict fertility. Some with large varicoceles have completely normal fertility, while others with smaller varicoceles may have abnormal semen results. For this reason, doctors usually consider several factors together, including semen analysis, hormone levels, testicular size, symptoms, and the couple's fertility history.

What does the evidence say about varicocele treatment?

Varicocele repair is one of the few treatments that can address a potentially reversible cause of male infertility. However, research has shown that its benefits are not the same for everyone.

Many studies have found improvements in sperm count and motility after treatment. The evidence for improving natural pregnancy or live birth rates is less consistent, although more recent studies focusing on carefully selected patients have reported more encouraging results.

Current clinical practice generally supports treatment in men who have:

• A clinically detectable varicocele
• Abnormal semen analysis
• Infertility where no major female fertility factor is present

Men with a varicocele but normal semen analysis often do not require treatment unless there are other concerns such as pain or testicular shrinkage.

How is a varicocele treated?

Two established treatment options are available.

Microsurgical varicocelectomy
This operation involves making a small incision in the groin to tie off the enlarged veins while preserving nearby arteries and lymphatic vessels. Using an operating microscope helps reduce the risk of complications and recurrence.

Varicocele embolization
This minimally invasive procedure is performed by an interventional radiologist. A thin catheter is inserted through a vein, usually in the groin or wrist, and guided to the affected vein using X-ray imaging. Tiny coils or a medical sclerosant are then used to block the abnormal vein, allowing blood to flow through healthy veins instead.

Patients usually return home the same day, and recovery is quicker than after surgery. Studies suggest that embolization and microsurgical repair offer similar success rates in appropriately selected patients.

What should you expect after treatment?

Improvements in semen quality usually take time. Because sperm production follows a cycle of around three months, repeat semen testing is typically performed three to six months after treatment.

Although recurrence can occur with any treatment, modern microsurgical techniques and embolization have relatively low recurrence rates when performed by experienced specialists.

Why Choose RIVEA?

• Specialist expertise: Varicocele embolization performed by Dr. Arjun Reddy, an experienced interventional radiologist.
• Advanced image guidance: Procedures use the Allia™ IGS 7 system for precise vein mapping and catheter navigation.
• Minimally invasive treatment: No surgical incision, with less discomfort and faster recovery for suitable patients.
• Same-day care: Most embolization procedures are completed as day-care treatments, allowing patients to return home the same day.
• Individualised treatment: Care is tailored to each patient's symptoms, fertility goals, and clinical findings.

A varicocele does not automatically mean infertility, and some patients with one never require treatment.

If you and your partner are having difficulty conceiving, or if a semen analysis shows abnormalities, a thorough assessment can help determine whether the varicocele is likely to be contributing. Treatment is most effective when it is offered to carefully selected patients rather than as a routine intervention for every varicocele.

An evaluation by a fertility specialist, urologist, or interventional radiologist can help identify the most appropriate next step based on your individual circumstances.