If you’ve been looking into male fertility for more than ten minutes, you’ve heard of varicocele. Enlarged veins in the scrotum, like varicose veins in the legs. Supposedly messes with sperm production. Fix the veins, fix the sperm. Simple, right?
Not so fast. I’ve been digging into the history of this surgery-from ancient Roman descriptions to the latest microsurgery studies-and what I found is a story where surgical confidence has always run way ahead of the evidence. Every generation of surgeons thought they had the answer. Every generation was partly wrong. And the lesson for any guy sitting in a urologist’s office today is this: don’t rush into the knife.
The Greeks Noticed It, Then Ignored It for 1,500 Years
The oldest description of a varicocele comes from Celsus, a Roman writer working around 25 AD. He called it cirsocele-a swelling of the scrotal veins-and described a procedure where they cut open the sac, pulled out the veins, and burned them with a hot iron. Ouch.
Galen, the Greek doctor whose ideas ruled medicine for over a thousand years, thought it was caused by an imbalance of “melancholic humors.” His treatment was diet, exercise, and bloodletting. Surgery only for the worst cases.
For the next 1,500 years, that was it. Nobody knew what a varicocele actually did to fertility because nobody was looking at sperm. The microscope wasn’t invented until the 1600s, and it took another two centuries for anyone to connect scrotal veins to sperm quality.
The 19th Century Surgical Boom (And the First Backlash)
In the 1800s, varicocele surgery got trendy. Not for fertility-for everything. Back pain, impotence, indigestion, “nervous debility.” The cure was always the same: tie off the veins.
Surgeons came up with dozens of methods. The most famous came from British surgeon Henry Thompson in 1855. He cut into the groin and ligated the spermatic vein. He reported high success rates. His follow-up period? A few weeks.
By the 1880s, varicocele repair was one of the most common operations in Europe and America. Some doctors performed it on young men just in case, convinced the condition would eventually cause sterility.
Then a German surgeon named Eduard Rindfleisch pushed back. He examined 1,000 men and found varicoceles in 15 percent of them-exactly the same rate we see today. Most had zero fertility problems. He argued that surgery was being done on men who didn’t need it and that the risks-infection, testicular atrophy, chronic pain-weren’t worth it.
Nobody listened. The surgeries kept happening.
The 20th Century: Finally, Some Data
The modern era kicked off in 1952, when Argentine urologist Juan Regino Del Valle published a study linking varicocele repair to better semen quality. He operated on 80 infertile men with enlarged scrotal veins. About 70 percent showed improvements in sperm count and motility. The paper ran in Fertility and Sterility, the top journal in the field.
For the first time, someone had numbers. Over the next twenty years, many more studies backed it up. The mechanism made sense: varicoceles trap warm blood near the testicles, raising temperature and hurting sperm production. Fix the blood flow, lower the heat, restore function.
By the 1980s, if you had a varicocele and were trying to conceive, you got surgery. No questions asked.
But some researchers weren’t satisfied. They saw a basic flaw: nearly all the studies were uncontrolled. They measured sperm before and after surgery, but they didn’t compare against men who didn’t get surgery. Without that control group, you can’t rule out the possibility that sperm quality would have improved on its own.
The Controversy That Won’t Die
In 1994, the first randomized controlled trial on varicocele repair hit The Lancet. Dr. Paul J. Madsen and his team at the University of Copenhagen took 200 infertile men with varicoceles, split them into a surgery group and a no-surgery group, and followed them for a year.
Pregnancy rates: 37 percent in the surgery group, 34 percent in the control group. Not statistically significant.
The study was small, and some urologists brushed it off. But it raised a question nobody had asked seriously: does varicocele surgery actually help couples get pregnant, or does it just make lab numbers look better?
A bigger trial came in 2001. Dr. Sandro C. Evers at the University of Maastricht randomized 257 men in the Netherlands. Same result: pregnancy rates nearly identical. Surgery offered no advantage over watchful waiting.
By the 2010s, the evidence was split. Meta-analyses came to opposite conclusions depending on which studies they included. Some found a modest benefit, especially for men with really low sperm counts. Others found nothing.
The Cochrane Review-the gold standard in evidence-based medicine-issued their verdict in 2012 and still stands by it: “There is some evidence that varicocele treatment may improve pregnancy rates in subfertile couples where the male partner has a clinically palpable varicocele, but the quality of the evidence is low.”
Low quality. That means the studies are too small, too short, or too poorly designed to trust the results.
Where the Data Sits Today
Based on the best research we have in 2025, here’s what the numbers look like:
- Roughly 15 percent of men have a varicocele. Most are fertile.
- Among men with infertility, varicocele is found in about 35 to 40 percent.
- Varicocele repair improves semen parameters in 60 to 70 percent of men.
- But the bump in pregnancy rates is smaller than most people think. The best estimates from the highest-quality trials show surgery increases the chance of pregnancy by about 10 to 15 percentage points over one to two years.
- The number needed to treat is around 7 to 10. Meaning you operate on seven to ten men for one extra couple to conceive.
These figures come from a 2021 meta-analysis in European Urology that included 19 randomized trials. The authors concluded microsurgical varicocelectomy is the most effective technique, with lower recurrence and complication rates than open surgery or embolization. But they also noted the overall quality of the evidence remains moderate at best.
Now, a quick note: I’m not a doctor and this isn’t medical advice. I’m just a guy who reads the studies. If you’re considering varicocele repair, talk to a urologist who specializes in male infertility. Every man’s situation is different, and you should make your own call with a qualified professional.
The Uncomfortable Truth
Varicocele surgery has survived for 2,000 years-through humors, cautery, and evidence debates-because it feels right. The logic is clean. The veins are obviously enlarged. Sperm production needs cool temperatures. Fix the plumbing, fix the problem.
But the human body doesn’t always cooperate with clean logic. Some men with big varicoceles have normal sperm. Some men with small varicoceles have severe infertility. Some guys who get surgery see huge improvements. Others see none. And plenty of men who skip surgery end up fathers anyway.
The historical pattern is unmistakable: every generation of surgeons believed they finally had the answer, and every generation was partially wrong.
What I’ve Learned From 2,000 Years of Cutting
After reading through the original papers, the old medical texts, and the modern analyses, here’s what stands out to me.
First, the decision to repair a varicocele should never be automatic. The old idea that any varicocele must be fixed has been disproven. Current guidelines from the American Urological Association recommend repair only for couples with documented infertility, a palpable varicocele, and abnormal semen analysis. Even then, they call the recommendation “conditional” based on “moderate” evidence.
Second, timing matters. Some studies suggest men with higher baseline sperm counts benefit less from surgery, while men with very low counts benefit more. If your count is borderline, the odds of improvement may be lower than you hope.
Third, the surgeon’s experience is huge. Microsurgical varicocelectomy from a high-volume surgeon has recurrence rates around 1 to 2 percent. Older non-microscopic techniques run 10 to 15 percent. This is not a procedure to get from someone who does two a year.
Fourth, lifestyle factors can help or hurt any surgical benefit. Testicular temperature is affected by tight underwear, prolonged sitting, hot baths, and yes, sauna use. A man who gets his varicocele fixed but keeps overheating his testicles may not see the full improvement. The research is clear that heat stress impairs sperm production regardless of varicocele status (Thonneau et al., 1998, Human Reproduction Update).
What to Do If You’re in This Situation
If you’re reading this because you or your partner are struggling to conceive, and you’ve been told you have a varicocele, here’s what I’d want you to know.
Pray you see a urologist who reads the literature critically. Some will tell you surgery is a slam dunk. Others will overcorrect and say it never works. The truth is somewhere in the middle. It works for some men, some of the time, and the pregnancy rate data is weaker than most people realize.
Get a second opinion. Ask what your specific sperm parameters are. Ask about the surgeon’s personal complication and recurrence rates. Ask whether watchful waiting for 6 to 12 months is reasonable in your case.
And don’t ignore the things you can control while you wait. Scrotal cooling, loose underwear, regular exercise, avoiding prolonged sitting, and maintaining a healthy body weight all have solid evidence behind them for supporting sperm quality. These won’t replace surgery if you need it, but they cost nothing and they work alongside any medical intervention.
The varicocele story is a cautionary tale about surgical certainty. It’s also a reminder that male fertility is complex-more complex than a few dilated veins. The history says we’ve been wrong before. The research says we’re probably still wrong about some things today.
The best move is to learn what the evidence actually shows, ask hard questions, and make your own decision with your eyes open.