Varicocele: Symptoms, Grades, and Modern Treatment Options

Many men first discover a varicocele almost by accident — during a routine exam, after noticing a “bag of worms” in the scrotum, or during a fertility workup when a semen analysis comes back abnormal. The condition is common, usually benign, and often silent, which is why it can go unnoticed for years. But when it does cause problems — pain, testicular atrophy, or subfertility — treatment can make a genuine difference.

This guide, written by a practising Istanbul urologist and andrologist, walks through how varicoceles are graded, what symptoms actually matter, how Doppler ultrasound confirms the diagnosis, and how modern microsurgical repair compares to embolization. It is written for men trying to make sense of a new diagnosis and for couples navigating an infertility workup.

What is a varicocele?

A varicocele is an abnormal dilation of the pampiniform plexus — the network of small veins that carries blood away from the testicle. Under normal conditions, one-way valves inside these veins keep blood flowing upward. When those valves fail or when downstream pressure is high, blood pools and the veins stretch, producing the characteristic soft, tangled swelling that clinicians describe as a “bag of worms.”

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Varicoceles are common. About 15% of adult men have one, rising to nearly 40% among men attending fertility clinics and 80% among men with secondary infertility. Most appear during puberty, when testicular blood flow surges, and remain stable for life. A small proportion cause meaningful problems — pain, testicular shrinkage, or reduced sperm production — and it is this subset that benefits from treatment.

Why almost always on the left side

Roughly 90% of varicoceles occur on the left side. This is not coincidence — it is anatomy:

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• The left testicular vein drains vertically into the left renal vein at a right angle. Column pressure is higher and valve failure is more likely.
• The right testicular vein drains obliquely into the inferior vena cava, which has lower pressure and gentler angulation.
• The left renal vein can be gently compressed between the aorta and the superior mesenteric artery (the “nutcracker” effect), further raising venous pressure.

An isolated right-sided varicocele in an adult is uncommon and should prompt an ultrasound of the retroperitoneum to rule out an obstructing mass. Bilateral varicoceles are more frequent than pure right-sided cases and are increasingly diagnosed with routine Doppler screening.

Symptoms — what actually matters

Most varicoceles are asymptomatic. When symptoms do occur, the pattern is fairly consistent:

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• Dull, dragging ache in the scrotum or lower groin, worse at the end of the day, after prolonged standing, or after heavy lifting
• Relief when lying down
• A soft, worm-like swelling above the testicle, more obvious in a warm room or after exertion
• A feeling of scrotal heaviness
• Testicular size asymmetry (the affected side smaller)
• Abnormal semen analysis discovered during a fertility workup

Sharp pain, sudden severe swelling, or scrotal redness are not typical varicocele symptoms and warrant urgent evaluation for other causes (torsion, epididymitis, hernia).

Grading: subclinical to Grade III

Varicoceles are graded by physical exam using the Dubin-Amelar system, refined with Doppler ultrasound:

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Higher grade correlates with higher likelihood of impaired semen quality and greater semen improvement after repair — but even Grade I varicoceles can affect fertility, and the decision to treat is not made on grade alone.

Testicular atrophy and hypotrophy

Persistent varicocele can gradually reduce the size of the affected testicle, a change called testicular hypotrophy. This is measured by ultrasound: a size discrepancy of more than 20% (or an absolute volume loss of 2 mL or more) is considered clinically significant, especially in adolescents.

Hypotrophy is one of the strongest indications for repair in a teenager or young adult, because catch-up growth of the testicle after varicocelectomy is well documented. In older men, the presence of hypotrophy correlates with reduced sperm production and a higher likelihood of benefit from surgery.

How varicocele affects fertility

Varicocele is the single most common surgically correctable cause of male infertility. The proposed mechanisms include:

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• Scrotal hyperthermia — pooled venous blood raises testicular temperature by 1–2 °C, disrupting spermatogenesis
• Oxidative stress — elevated reactive oxygen species damage sperm DNA
• Hypoxia — stagnant venous flow reduces oxygen delivery
• Reflux of adrenal metabolites — from the renal vein back into the testicular circulation
• Leydig cell dysfunction — with reduced intratesticular testosterone in advanced cases

Typical semen findings include decreased sperm concentration, reduced motility, and abnormal morphology — the so-called “stress pattern.” DNA fragmentation index is often elevated, which matters not only for spontaneous pregnancy but also for IVF and ICSI outcomes.

Diagnosis — physical exam + Doppler ultrasound

A varicocele is diagnosed clinically, then confirmed and graded with imaging:

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1. Standing exam in a warm room. The urologist palpates the spermatic cord above the testicle while the man performs a Valsalva manoeuvre (bearing down as if lifting a heavy weight).
2. Scrotal Doppler ultrasound. This measures venous diameter and confirms retrograde flow. Reflux lasting more than 2 seconds during Valsalva is diagnostic.
3. Semen analysis — always ordered when infertility is a concern. WHO 2021 (6th edition) reference values apply.
4. Hormonal panel — total testosterone, FSH, LH, prolactin. Elevated FSH suggests significant testicular dysfunction.

Additional tests (karyotype, Y-chromosome microdeletion, sperm DNA fragmentation) are added selectively when the presentation warrants.

When to treat and when to observe

Not every varicocele needs treatment. The EAU and AUA guidelines converge on the following indications for repair:

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• Palpable varicocele + abnormal semen analysis + infertility (partner also evaluated)
• Adolescent varicocele with progressive testicular hypotrophy
• Symptomatic varicocele with pain that impairs quality of life and does not respond to conservative measures
• Hypogonadism attributable to the varicocele in a symptomatic man

An isolated, painless, subclinical varicocele in a fertile man with normal semen is not an indication for surgery. Observation with periodic reassessment is appropriate.

Microsurgical varicocelectomy — the gold standard

Microsurgical subinguinal varicocelectomy is today’s reference standard. Under an operating microscope (10–25× magnification), the surgeon opens a 2–3 cm incision below the external inguinal ring, exposes the spermatic cord, and individually ligates every internal spermatic vein while preserving:

• The testicular artery (crucial for testicular blood supply)
• The lymphatics (avoiding postoperative hydrocele)
• The vas deferens and its vessels

Compared with older open (Palomo, Ivanissevich) or laparoscopic techniques, microsurgical repair produces:

• Lower recurrence rate (~1–2% vs 10–15%)
• Lower hydrocele rate (~0.5% vs 5–10%)
• Very low risk of arterial injury
• Outpatient surgery, typically 45–90 minutes under local, spinal, or light general anaesthesia

This is why the microscopic varicocele surgery approach is preferred in dedicated andrology centres.

Percutaneous embolization — the alternative

Interventional radiologists offer percutaneous embolization, in which a catheter is passed through the femoral or jugular vein into the internal spermatic vein, and coils or a sclerosant are deployed to block reflux. Advantages: no scrotal incision, rapid same-day recovery, potential to treat bilateral cases in one setting.

For a topline summary, read common causes of male infertility.

Trade-offs: technical failure in about 5–10% (venous anatomy not amenable), radiation exposure, higher recurrence rate compared with microsurgery, and outcomes that in most head-to-head studies still favour microsurgical repair for semen improvement. It remains a reasonable option for selected men, particularly those with prior groin surgery or those who strongly prefer to avoid an incision.

Realistic outcomes for semen and pregnancy

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Semen changes are gradual — most improvement is visible at 3–6 months, with continued gains up to 12 months. Couples should not expect immediate results the month after surgery.

Recovery timeline

• Day of surgery: Home the same day. Scrotal support and cold compresses. Mild analgesia (paracetamol ± NSAID).
• Days 1–3: Local swelling and bruising are normal. Walking encouraged, no lifting.
• Days 3–5: Return to desk work.
• Week 2: Light exercise, driving.
• Week 3: Full exercise, sexual activity.
• Months 3–6: First follow-up semen analysis.
• Month 12: Peak semen improvement assessment.

Complications and how they are avoided

Modern microsurgical varicocelectomy is very safe, but no operation is risk-free. The main issues to know about:

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• Recurrence (~1–2%) — from missed collateral veins; minimised by microscope use
• Hydrocele (~0.5%) — from inadvertent lymphatic ligation
• Testicular artery injury (rare) — avoided by microscopic identification
• Wound infection or hematoma (<1%)
• Persistent scrotal discomfort — uncommon but not zero

Doctor’s perspective — Op. Dr. Cem İpek

Every week I see couples who have spent two or three years chasing IVF cycles before anyone examined the husband properly. In many of them there is a palpable varicocele that was never mentioned. Repairing it does not guarantee pregnancy, but in the right patient it can shift the couple from ICSI candidacy to spontaneous or IUI conception. That single conversation changes lives.

The operating microscope is not a luxury — it is what turns varicocelectomy from an operation with a 10–15% recurrence rate into one with a 1–2% recurrence rate, and it is what protects the testicular artery. If a surgeon offers you “loupe magnification” varicocelectomy at a discount, ask why they are not using a true microscope.

I am careful with expectations. Semen parameters improve in most, but not all, men after repair. Pregnancy is influenced by both partners. What we can honestly promise is a real, measurable, sustained improvement in testicular biology — and, in many couples, a genuine second chance at natural conception.

When to see a urologist

Book an appointment if any of the following applies:

• A soft, worm-like swelling in the scrotum, especially on the left
• Persistent dull scrotal ache, worse after standing or exertion
• Noticeable size difference between the two testicles
• Trying to conceive for more than 12 months without success (or 6 months if the female partner is over 35)
• Abnormal semen analysis
• Adolescent boy with a visible varicocele or smaller testis on one side
• New-onset right-sided varicocele in an adult

Frequently asked questions