Varicocele
Varicocele and Its Repair: The Most Common Correctable Cause of Male Infertility
Evidence grade 3 of 5, Mixed. Read how the Atlas grades evidence.
The written rationale for this grade is still being prepared.
- FDA
- Not applicable (surgical/embolization procedure)
Reference only. Not medical advice.
What can go wrong
Repair is generally low-risk but carries possible complications: hydrocele formation (lowest with microsurgical technique), varicocele recurrence, and rare testicular artery injury. The central controversy is efficacy: while repair consistently improves semen parameters in meta-analyses, high-quality evidence that it increases spontaneous pregnancy or live-birth rates is mixed. Guidelines (AUA/ASRM) recommend repair in infertile men with a clinical varicocele, abnormal semen, and an otherwise fertile or treatable partner, not for subclinical varicoceles or normal semen.
This is something to take to a clinician. The Atlas can tell you what is known about varicocele in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.
A varicocele is an abnormal dilation of the pampiniform venous plexus draining the testis, analogous to a varicose vein in the scrotum. It is found in roughly 15% of the general male population but in about 35-40% of men evaluated for primary infertility, making it the most common identifiable and correctable cause of male infertility. Repair (microsurgical varicocelectomy or radiologic embolization) can improve semen parameters, though its effect on live-birth rates remains debated.
Present in ~15% of all men and ~40% of infertile men, and surgically correctable.
What people take it for
These are the reasons people give for taking it. They are not effects it has been shown to have.
How it is supposed to work
The proposed mechanisms by which a varicocele impairs fertility include elevated scrotal temperature from pooled venous blood, reflux of adrenal and renal metabolites, venous stasis and hypoxia, and resulting oxidative stress and increased sperm DNA fragmentation. The left-sided predominance reflects anatomy: the left testicular vein drains at a right angle into the left renal vein, raising back-pressure. Repair aims to ligate or occlude the refluxing veins while sparing the testicular artery and lymphatics.
The pampiniform plexus is a network of small veins surrounding the testicular artery in the spermatic cord; it normally acts as a countercurrent heat exchanger cooling arterial blood before it reaches the testis. When these veins dilate and reflux, the cooling function is degraded and scrotal temperature rises, which is plausibly harmful to the heat-sensitive process of spermatogenesis.
What it does to fertility
Varicocele is the prototypical reversible male-factor problem: identification and repair can move a couple from candidacy for IVF/ICSI toward natural conception or lower-intensity treatment. It is also relevant to the testosterone story, since some studies report modest serum testosterone improvement after repair, reflecting the varicocele's effect on Leydig-cell function as well as on sperm.
What people get wrong
Often saidEvery varicocele should be fixed
ActuallySubclinical (non-palpable) varicoceles and varicoceles in men with normal semen are not recommended for repair; guidelines reserve surgery for clinical varicocele with documented semen abnormality and infertility.
Often saidRepair guarantees a pregnancy
ActuallyRepair reliably improves semen parameters but the evidence for increased live births is mixed; some couples will still require assisted reproduction.
Who profits, and who pushes back
Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.
How we got here
Varicocele has been recognized since antiquity; the association with testicular atrophy was noted in the 19th century. Surgical ligation for infertility became common in the 20th century, but the field was repeatedly challenged by trials questioning whether semen-parameter improvements translated into babies. The introduction of operating-microscope (microsurgical) technique by Goldstein and others sharply reduced complications and refocused the debate on patient selection.
Set against the alternatives
Treatment options include microsurgical subinguinal varicocelectomy (lowest recurrence and complication rates, considered gold standard), open inguinal/retroperitoneal ligation, laparoscopic ligation, and percutaneous radiologic embolization (no incision, performed by interventional radiology, comparable outcomes in selected patients). Choice depends on surgeon expertise and patient anatomy.
At a glance
- Prevalence, general men
- ~15%
- Prevalence, primary infertility
- ~35-40%
- Prevalence, secondary infertility
- up to ~80%
- Side predominance
- ~80-90% left-sided
- Gold-standard repair
- Microsurgical subinguinal varicocelectomy
- Grading
- Clinical grades 1-3 plus subclinical
What this entry does not yet cover
What follows is unfinished work on our side, not a finding about Varicocele. A short entry is not a safe entry.
- Timeline. We have not built the dated record of research and regulatory events.
- Cost and market. We have not documented what it sells for or who sells it.
- Supply chain. We have not mapped where it is made.
- Who uses it. We have not documented the user groups.
- What could change. No forward-looking summary yet.
- Children and teenagers. We have not checked what is known about younger people.
- Where we land. We have not taken a position on this yet.
Sources
The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.
The studies that matter
Cochrane review (Kroese et al.)2012
Earlier review found insufficient evidence that varicocele treatment improves pregnancy rates; later analyses restricting to clinical varicoceles with abnormal semen were more favorable
Baazeem et al. meta-analysis, European Urology2011
Varicocelectomy significantly improved sperm concentration and motility in men with clinical varicocele and abnormal semen
AUA/ASRM Male Infertility Guideline2021
Recommends varicocele repair for men with clinical varicocele, infertility, and abnormal semen parameters; does not recommend repair for subclinical varicocele or normal semen