A varicocele is an enlarged group of veins in the scrotum, usually above the testicle. It is similar to a varicose vein in the leg, but it forms around the spermatic cord, where blood normally drains away from the testicle. Many men never feel it. Others notice a dull ache, heaviness, visible veins, a smaller testicle, or fertility problems after trying to conceive.
The main reason varicoceles get attention is their link with sperm quality. A clinically significant varicocele can raise scrotal temperature, increase oxidative stress, and affect sperm count, motility, shape, and DNA quality. Treatment is not automatic, though. Small varicoceles found only on ultrasound often do not need repair. The decision usually depends on symptoms, exam findings, semen analysis, hormone results, fertility plans, and the female partner’s timeline.
Table of Contents
- What a Varicocele Is
- Symptoms and Warning Signs
- How Doctors Diagnose It
- Fertility and Sperm Quality
- Testosterone and Testicular Health
- When Treatment Is Needed
- Treatment Options and Recovery
- Follow-Up and Common Mistakes
What a Varicocele Is
A varicocele forms when veins in the pampiniform plexus become enlarged. This vein network helps cool blood before it reaches the testicle. When blood pools instead of draining smoothly, the veins stretch and can become noticeable during a standing exam.
Varicoceles are much more common on the left side. The left testicular vein drains into the left renal vein at an angle that can make blood flow less efficient. Right-sided varicoceles can occur, and some men have them on both sides, but an isolated new right-sided varicocele is less typical and may need closer evaluation.
A varicocele is not cancer. It is not an infection. It is not caused by sex, masturbation, or poor hygiene. It also does not mean a man is infertile. Many men with varicoceles have normal semen results and father children without treatment.
The issue is that some varicoceles are linked with testicular stress. The testicles work best at a slightly cooler temperature than the rest of the body. A varicocele may interfere with that cooling system. It may also increase local pressure, reduce oxygen delivery, and raise oxidative stress, which can damage sperm cells.
Doctors usually separate varicoceles into two broad groups:
- Clinical varicocele: can be felt on physical exam, sometimes seen through the scrotal skin.
- Subclinical varicocele: cannot be felt but appears on ultrasound.
That difference matters. Clinical varicoceles are the ones most often considered for treatment when there are symptoms, abnormal semen results, testicular size changes, or selected hormone concerns. Subclinical varicoceles found only by imaging usually do not need repair.
Varicoceles also have grades. A small one may only be felt when a man bears down, called a Valsalva maneuver. A moderate one can be felt while standing without bearing down. A large one may be visible and feel like a “bag of worms” above the testicle.
Symptoms and Warning Signs
Most varicoceles are quiet. A man may only learn he has one during a routine exam, a fertility workup, or an ultrasound done for another reason. When symptoms do appear, they are often mild and come and go.
Common symptoms include:
- A dull ache in the scrotum, usually worse after standing, lifting, exercise, or a long day
- A heavy or dragging feeling around one testicle
- Enlarged veins above the testicle
- A soft, worm-like texture in the upper scrotum
- One testicle looking smaller than the other
- Fertility problems after months of trying to conceive
Pain from a varicocele usually builds gradually. It often feels better when lying down because gravity is no longer pulling blood into the dilated veins. Sharp, sudden, severe testicular pain is not typical for a simple varicocele.
Seek urgent care for sudden severe testicular pain, nausea with testicular pain, a high-riding testicle, fever, scrotal redness, or major swelling. These symptoms may point to torsion, infection, injury, or another condition that needs quick treatment. A guide to testicular pain warning signs can help separate slow aching discomfort from symptoms that should not wait.
A lump inside the testicle is also different from a varicocele. Varicocele veins are usually above or around the testicle, not a hard lump within it. Any firm testicular lump, new swelling, or unexplained change in testicle size should be checked. Men who are unsure what they are feeling can review how to perform a testicular self-exam, then schedule an exam rather than guessing.
A varicocele can be frustrating because the symptoms may not match the size. Some large varicoceles cause no pain. Some smaller ones ache after workouts or long standing shifts. Symptoms alone do not show whether sperm quality is affected, which is why testing matters when fertility is a goal.
How Doctors Diagnose It
A careful physical exam is the starting point. The exam is usually done while standing because varicoceles can shrink or disappear when lying down. The clinician may ask the patient to bear down briefly, which increases abdominal pressure and makes a small varicocele easier to feel.
Doctors look for three things during the exam: whether the veins are palpable, the grade of the varicocele, and whether the testicles feel normal in size and texture. Testicular size matters because a smaller testicle can suggest long-term stress or impaired development, especially in adolescents and young men.
Ultrasound is useful when the exam is unclear, when the anatomy is hard to assess, when pain has another possible cause, or when a repaired varicocele may have returned. A Doppler ultrasound can measure vein size and blood reflux. It can also check for other causes of swelling, such as a hydrocele, spermatocele, hernia, or testicular mass.
Ultrasound should not replace a good exam in every man. A tiny vein abnormality found only on imaging may not be clinically important. Treating every ultrasound finding can lead to overtreatment, cost, and recovery time without a clear benefit.
A fertility evaluation usually includes semen analysis. This test measures semen volume, sperm concentration, total sperm number, movement, and shape. It is often repeated because sperm results naturally vary from sample to sample. Men trying to understand the report may find a plain-language explanation of semen analysis results helpful before discussing next steps with a specialist.
Hormone testing is not always required for every varicocele, but it may be useful when there are signs of low testosterone, small testes, low sperm count, erectile changes, low libido, fatigue, or infertility. Common labs include total testosterone, FSH, LH, and sometimes prolactin or estradiol depending on the situation. For a broader workup, male fertility testing can include semen analysis, hormone labs, genetic tests, and imaging based on the pattern of results.
Fertility and Sperm Quality
A varicocele can affect fertility, but it does not affect every man the same way. Some men with large varicoceles have normal sperm. Others with a clear clinical varicocele have low sperm count, poor movement, abnormal shape, or high sperm DNA fragmentation.
The leading theory is that the varicocele changes the testicular environment. Blood pooling can raise scrotal temperature. The testicle may receive less efficient oxygen exchange. Oxidative stress may increase. Over time, these changes can interfere with sperm production and sperm cell quality.
The semen pattern often linked with varicocele includes:
- Lower sperm concentration
- Lower total sperm count
- Reduced motility, meaning fewer sperm swim well
- More abnormal sperm forms
- Higher sperm DNA damage in some men
Sperm count gets the most attention, but motility and DNA quality also matter. A man may have enough sperm by count but still have trouble conceiving if movement is poor or DNA damage is high. Men with low concentration can review common causes of low sperm count, while men with movement issues may need a closer look at poor sperm motility.
Sperm DNA fragmentation is a more specialized test. It looks at breaks in sperm DNA. High fragmentation has been linked with lower natural conception rates, miscarriage risk, and poorer outcomes in some assisted reproduction settings. Varicocele is one possible contributor, but smoking, age, infection, heat exposure, obesity, and other factors can also play a role. Testing is usually considered when there is unexplained infertility, recurrent pregnancy loss, failed assisted reproduction, or a mismatch between “okay” semen numbers and ongoing fertility problems. A deeper explanation of sperm DNA fragmentation can help clarify when this test adds value.
Time matters because sperm production takes roughly three months. If a varicocele is repaired, semen changes are not immediate. Many doctors recheck semen analysis around three to four months after treatment, then again later if needed. Some men improve by the first follow-up. Others take six months or more. Not everyone improves enough to avoid fertility treatment.
Female partner factors also shape the decision. If the female partner is younger with good ovarian reserve, waiting several months after varicocele repair may be reasonable. If she is older, has low ovarian reserve, blocked tubes, severe endometriosis, or time-sensitive fertility concerns, the couple may consider assisted reproduction sooner, with or without varicocele repair.
Testosterone and Testicular Health
The testicles make both sperm and testosterone. A varicocele may affect one or both functions, especially when it is large, long-standing, or linked with testicular shrinkage. The cells that produce testosterone, called Leydig cells, may be sensitive to heat, oxidative stress, and reduced oxygen delivery.
Not every man with a varicocele has low testosterone. Many have normal hormone levels. But in men with symptoms of low testosterone and a clinical varicocele, hormone testing may be reasonable. Symptoms can include lower sex drive, fewer morning erections, fatigue, loss of strength, mood changes, or reduced exercise recovery. These symptoms are not specific, so labs are needed before blaming the varicocele.
A single testosterone result can be misleading. Testosterone should usually be checked in the morning, and low results are often repeated before a diagnosis is made. LH and FSH help show whether the signal from the brain to the testicles is normal, high, or low. A man with fertility goals should be especially careful with testosterone replacement therapy because outside testosterone can suppress sperm production.
Varicocele repair may raise testosterone in selected men, especially those who start with low levels, but it is not a guaranteed hormone treatment. The decision should be individualized. A man who has no fertility goals and clear testosterone deficiency may have several treatment choices. A man who wants children may need options that protect sperm production.
A related discussion of varicocele and testosterone can be helpful when the main concern is hormone health rather than pain or fertility.
Testicular size also matters. In adolescents, a varicocele can be watched if both testicles are growing normally. Repair is more strongly considered when the affected testicle is persistently smaller, often described as a size difference of more than 20% or more than 2 mL on repeated measurements. In adults, a smaller testicle may suggest past or ongoing testicular damage, but repair decisions still depend on symptoms, semen results, hormone findings, and goals.
When Treatment Is Needed
A varicocele does not always need treatment. Observation is common when it causes no pain, the semen analysis is normal, testicle size is stable, and fertility is not currently a concern. Many men simply monitor symptoms and return if something changes.
Treatment is more likely to be considered when there is a clear reason to intervene.
| Situation | Why repair may help | Important caveat |
|---|---|---|
| Infertility with a palpable varicocele and abnormal semen results | Repair may improve sperm concentration and pregnancy chances in selected couples | Improvement takes months and is not guaranteed |
| Persistent dull scrotal pain | Repair can reduce aching when the pain pattern fits varicocele pain | Other pain causes should be ruled out first |
| Adolescent or young man with smaller affected testicle | Repair may protect testicular growth in selected cases | Many adolescents with varicocele never develop fertility problems |
| Raised sperm DNA fragmentation with otherwise unclear infertility | Repair may reduce oxidative stress-related sperm DNA damage | This is a more individualized decision |
| Low testosterone with clinical varicocele | Some men may see hormone improvement after repair | Evidence is less definitive than for infertility with abnormal semen results |
Treatment is usually not recommended for a varicocele that is only found on ultrasound and cannot be felt on exam. It is also usually not recommended for an infertile man with normal semen analysis unless there are special circumstances, such as elevated sperm DNA fragmentation after other causes have been considered.
Pain treatment needs careful judgment. Varicocele pain is usually dull, heavy, and worse with standing. If the pain is sharp, burning, constant, linked to urination, linked to ejaculation, or associated with fever, the cause may be something else. Pelvic floor tension, epididymitis, hernia, nerve irritation, kidney stones, and testicular tumors can all mimic or overlap with scrotal discomfort.
Fertility treatment decisions should involve both partners. A varicocele may be one correctable male factor, but conception depends on egg quality, ovulation, fallopian tubes, uterine health, timing, and duration of infertility. Couples should avoid a plan that focuses only on the varicocele while ignoring the female partner’s age or ovarian reserve.
Treatment Options and Recovery
Varicocele treatment works by blocking the enlarged internal spermatic veins so blood reroutes through healthier drainage pathways. The goal is to reduce venous pooling while protecting the testicular artery, lymph vessels, and nearby structures.
The main options are microsurgical varicocelectomy, laparoscopic surgery, and percutaneous embolization.
Microsurgical varicocelectomy is often done through a small groin or upper scrotal incision using magnification. The surgeon identifies and ties off the problem veins while preserving arteries and lymphatics. The subinguinal microsurgical approach is commonly favored because it has low recurrence and complication rates when performed by an experienced surgeon.
Laparoscopic varicocelectomy uses small abdominal incisions and a camera. It can be useful for bilateral varicoceles, but it involves entering the abdomen and may carry different risks than the microsurgical approach.
Percutaneous embolization is performed by an interventional radiologist. A catheter is guided through a vein, and coils or other materials are used to block the refluxing vein from inside. It avoids a surgical incision in the groin, but the vein can be difficult to access in some men. Embolization may also be considered for recurrence after prior surgery.
A detailed guide to varicocele surgery can help compare why one approach may be better for fertility, pain, recurrence, or recovery.
Recovery varies by technique and job demands. Many men go home the same day. Soreness, swelling, and bruising are common for several days. Light activity often resumes within a few days, while heavy lifting, intense workouts, and sex may be restricted for one to two weeks or longer depending on the procedure and surgeon’s instructions.
Fertility follow-up takes longer than pain recovery. Because sperm production cycles take about three months, semen analysis is usually repeated after enough time has passed. A typical follow-up plan may include:
- Post-procedure check to review incision healing, swelling, and pain.
- Repeat semen analysis around three to four months after repair.
- Another semen analysis at six months if the couple is still trying or results are changing.
- Hormone retesting if low testosterone or abnormal FSH/LH was part of the original concern.
- Fertility planning with a reproductive urologist and fertility specialist if pregnancy has not occurred.
Possible complications include recurrence, hydrocele, infection, bleeding, persistent pain, testicular artery injury, and failure to improve semen results. These risks are generally low with experienced care, but they should be discussed before treatment.
Repair can improve the odds for selected men, but it is not a shortcut around all fertility problems. Some couples still need intrauterine insemination, IVF, or ICSI. Others may conceive naturally after semen quality improves. The best plan depends on the couple’s full fertility picture, not the varicocele alone.
Follow-Up and Common Mistakes
The first mistake is treating an ultrasound finding instead of the patient. A small subclinical varicocele found during imaging may sound important, but if it cannot be felt, semen results are normal, and there are no symptoms, repair may offer little benefit.
The second mistake is skipping semen analysis. A man may assume that a large varicocele means poor fertility, or that no pain means normal fertility. Neither is reliable. Semen testing gives a clearer baseline. At-home tests may estimate sperm concentration, but they do not replace a full lab semen analysis when a varicocele, infertility, or abnormal result is involved. Men curious about screening can compare what at-home sperm tests measure and what they miss.
The third mistake is expecting immediate fertility improvement. Sperm made before repair may still appear in the semen for weeks. Meaningful changes usually take at least one sperm production cycle. Couples should plan around a three- to six-month window, while also considering female partner age and fertility factors.
The fourth mistake is assuming supplements can fix a clinical varicocele. Antioxidants, sleep, exercise, weight management, avoiding tobacco, and limiting heat exposure can support sperm health, but they do not close enlarged veins. Lifestyle changes are helpful, especially when combined with a clear medical plan, but they should not delay needed evaluation for months or years.
The fifth mistake is ignoring recurrence or persistent symptoms. If a treated varicocele still feels large, pain returns, or semen results do not improve, follow-up ultrasound may be needed to check for persistent or recurrent reflux. Sometimes the issue is not recurrence but another cause of pain or infertility.
A useful appointment checklist includes:
- Which side is affected, and what grade is it?
- Is it palpable or only seen on ultrasound?
- Are both testicles normal in size?
- Do I need one semen analysis or two?
- Are my sperm count, motility, and morphology normal?
- Should I check testosterone, FSH, and LH?
- Does my partner’s age or ovarian reserve change the timing?
- Would repair likely help pain, fertility, hormones, or none of these?
- Which repair method do you recommend, and why?
- When should semen testing be repeated after treatment?
Varicocele care is most effective when the plan matches the reason for treatment. A man with pain needs a pain-focused evaluation. A couple trying to conceive needs both partners assessed. A man with low testosterone symptoms needs hormone testing before decisions are made. The same enlarged veins can mean different things in different situations.
References
- Sexual and Reproductive Health 2026 (Guideline)
- Diagnosis and Treatment of Infertility in Men: AUA/ ASRM Guideline Part II 2021 (Guideline)
- Surgery or radiological treatment for varicoceles in subfertile men 2021 (Systematic Review)
- The Effect of Varicocele Treatment on Fertility in Adults: A Systematic Review and Meta-analysis of Published Prospective Trials 2023 (Systematic Review)
- Recent Guidelines and Perspectives for Varicocele: A Clinical Consensus and Recommendations from the Korean Society for Sexual Medicine and Andrology 2025 (Guideline)
- Effects of Varicocele Repair on Testicular Endocrine Function: A Systematic Review and Meta-Analysis 2025 (Systematic Review)
Disclaimer
This article is for educational purposes and should not replace care from a qualified clinician. Scrotal pain, testicular swelling, infertility, abnormal semen results, or low testosterone symptoms should be evaluated by a healthcare professional, preferably a urologist or reproductive urologist. Seek urgent care for sudden severe testicular pain, fever, nausea, or rapid swelling.
