I have a varicocele — should it be fixed?

The three conditions

Guideline-aligned reviews converge on repair when all three of the following are true:¹²

• there is documented infertility in the couple;
• the varicocele is clinically palpable on examination;
• the semen parameters are impaired.

Particularly where the female partner's fertility is normal or treatable.

The presence of a varicocele alone is not an indication. And repair of a subclinical varicocele — one visible on ultrasound but not palpable — is not recommended, because the benefit is small or absent.¹³⁴

That is the sentence which disqualifies most of the men who arrive asking for this operation.

What it does to the semen analysis

Here the evidence is strong.

A meta-analysis of 2,420 infertile men compared against untreated controls found repair significantly improved sperm concentration, total count, progressive motility, total motility and normal morphology — though with high variation between studies.⁵ A much larger before-and-after analysis pooling 351 studies found improvement in nearly every conventional parameter.⁶

The biology moves in the same direction. Across 29 studies, repair significantly reduced sperm DNA fragmentation (standardised mean difference −1.125) and seminal malondialdehyde, a marker of oxidative damage (−2.450).⁷ Testosterone rises too, by a mean of about 82 ng/dL — roughly 2.9 nmol/L — after repair.⁸

What it does to pregnancies

Better than I would have said five years ago, and still more variable than the semen data.

The single most useful piece of evidence is a randomised trial in men with palpable varicoceles and impaired semen quality. Spontaneous pregnancy occurred in 32.9% after microsurgical repair against 13.9% with observation — an odds ratio of 3.04, and a number needed to treat of 5.27.⁹

That last number is the one worth carrying into a consultation. Operate on roughly five appropriately selected men and you produce one pregnancy that would not otherwise have happened.

Meta-analyses point the same way — one 31-study analysis reported an odds ratio of 1.82 for pregnancy and 2.80 for live birth¹⁰ — but other reviews describe the overall fertility evidence as heterogeneous and, in places, low quality.¹¹¹² I would rather you knew that than found it later.

Why the surgical approach matters

If the operation is right, how it is done changes the result.

Network meta-analysis of the surgical options ranks microsurgical subinguinal varicocelectomy highest overall, with the lowest recurrence rate while keeping the risk of hydrocele low.¹³¹⁴ The reason is mechanical rather than theoretical: magnification allows the testicular artery and the lymphatics to be identified and preserved, which is what prevents hydrocele and vascular injury.¹⁵¹⁶

The trade-off is operating time. Microsurgery takes longer than the open non-microsurgical or laparoscopic alternatives. The outcome profile is better.¹³¹⁷

This is the approach I use, and it is the reason I would rather a man travelled for the operation than had a quicker version of it locally.

If the problem is pain rather than fertility

A separate and legitimate indication. Systematic reviews report improvement or resolution of varicocele-related scrotal pain in up to about 90% of cases, again best with the microsurgical subinguinal technique.²¹⁶

But the assessment must come first. Varicoceles are extremely common incidental findings, and scrotal pain has many other causes — operating on a varicocele that happens to coexist with unrelated pain is a reliable way to disappoint both of us.¹⁸

If you are already heading for IVF

The evidence here has grown recently and it separates by treatment type.

Before ICSI, varicocele repair is associated with better fertilisation, clinical pregnancy and live-birth rates.¹⁹ A second meta-analysis found higher clinical pregnancy and live birth after assisted reproduction in treated men, while calling for larger trials.²⁰

Before IUI, the evidence for benefit is weak or absent.¹⁹

And if there is no sperm at all

Promising, but the least secure ground on this page.

In men with non-obstructive azoospermia and a clinical varicocele, controlled meta-analysis suggests repair can improve surgical sperm retrieval rates, increase the chance of sperm reappearing in the ejaculate, and sometimes improve ICSI outcomes.²¹ But most of these studies are observational, and the reviews are unanimous that this requires careful counselling and careful selection rather than routine offering.²¹²²²³

Who actually benefits

This is where a good assessment earns its money. Better preoperative sperm concentration, higher total motile sperm count and larger vein diameter all predict a higher chance of benefit from surgery.²⁴

Which means the men most likely to gain are not always the men with the worst results — and that the decision should follow a proper examination and at least two semen analyses, not an ultrasound report.

How strong is the evidence?

Strong for semen parameters, DNA fragmentation and testosterone. Moderate and more variable for pregnancy and live birth. Good for pain. Weakest, and explicitly observational, for azoospermia.

The randomised trial with a number needed to treat of five is the best single piece of evidence for a fertility benefit.⁹ The Cochrane position remains more cautious than the newer meta-analyses, and both deserve to be on the table.¹²

Bottom line

Varicocele repair works, in the men who meet the criteria. It improves the semen analysis reliably, reduces DNA damage, raises testosterone modestly, relieves pain in most men who have it, and produces roughly one extra pregnancy for every five appropriately selected men operated on.

It does nothing useful for a subclinical varicocele found incidentally on a scan, and nothing useful for a man whose partner's clock cannot accommodate the six to twelve months it takes to see an effect.

This is the operation I am asked for most and agree to least often. It has a real place — a clinical varicocele, abnormal parameters, and a partner whose own clock allows the six to twelve months it takes to see an effect. Outside that, I will usually advise against it and explain exactly why.