When pregnancy does not occur, the first focus is usually on ovulation, ovarian reserve, fallopian tubes, or uterine condition. However, infertility is not only a female issue. Male factors—sperm quality, testicular function, and the reproductive system—must also be evaluated from the beginning.

Varicocele is one of the conditions that may be identified during male infertility evaluation. However, having a varicocele does not always mean infertility, and not every patient requires surgery.

On the other hand, a normal semen analysis alone does not guarantee that all aspects of male fertility are normal.

So the key question is not “Is varicocele good or bad?”, but rather:

Is varicocele detectable on physical examination?
Is the couple experiencing infertility?
Is the semen analysis abnormal?
Has the female partner been evaluated?
Is the couple trying naturally or planning IVF/ICSI?
Would treating varicocele actually be beneficial in this situation?

In this article, we review these questions based on WHO recommendations, WHO semen analysis standards, and official health guidelines from Abu Dhabi and Dubai.

Quick Answer: Does Varicocele Cause Infertility?

Varicocele can in some men affect sperm production, reduce sperm count or motility, and alter the testicular environment. However, many men with varicocele still father children without treatment.

According to WHO recommendations, treatment is generally considered when:

The man is part of an infertile couple
A clinical (palpable) varicocele is present
Semen analysis is abnormal

A varicocele seen only on ultrasound, without physical findings or fertility issues, does not automatically require surgery.

What Is Varicocele?

Varicocele is an abnormal enlargement of the veins around the testicle. These veins are part of the system that drains blood from the testicle and helps regulate its temperature.

When venous valves or blood flow do not function properly, blood pools in the veins, causing them to enlarge and become twisted—similar to varicose veins in the legs.

Varicocele is more common on the left side of the scrotum. Many men have no symptoms, and it is often discovered during infertility evaluation or routine examination.

Possible symptoms include:

Heaviness in the scrotum
Dull pain, especially after standing long periods
Increased discomfort after exercise
Relief when lying down
Visible or palpable enlarged veins
Difference in testicular size
Abnormal semen analysis results

Symptoms alone do not confirm diagnosis; other causes of testicular pain must be ruled out by a physician.

Clinical vs Subclinical (Ultrasound) Varicocele

This distinction is critical for treatment decisions.

Clinical Varicocele

A clinical varicocele is detectable by physical examination. The doctor typically examines the patient while standing and may use the Valsalva maneuver.

WHO treatment recommendations mainly apply to clinical varicocele.

Subclinical (Ultrasound-Detected) Varicocele

This type is not detectable by touch and is only seen on Doppler ultrasound.

Mild vein dilation on ultrasound alone does not prove that varicocele is the cause of infertility or that surgery will improve fertility outcomes.

Therefore, treatment should not be based solely on ultrasound findings.

According to the World Health Organization (WHO), varicocele surgery is not recommended for all men.

Treatment is mainly considered when:

The couple is infertile
Pregnancy is desired
A clinical varicocele is present
One or more semen parameters are abnormal

These recommendations apply mainly to couples not currently undergoing assisted reproductive technologies (ART) such as IVF or ICSI.

Importantly, WHO guidance should not be interpreted as meaning all men must undergo surgery before IVF.

What If Sperm Analysis Is Normal?

WHO distinguishes between abnormal and normal semen parameters.

In a man who:

Has a clinical varicocele
Has normal semen analysis
Has no other symptoms

The benefit of surgery for improving fertility is not clearly established.

However, a “normal” semen analysis must still be interpreted carefully. A single test cannot fully define male fertility.

What Does a Semen Analysis Measure?

According to WHO laboratory guidelines, semen analysis evaluates:

Semen volume
Sperm concentration
Total sperm count
Total motility
Progressive motility
Vitality
Morphology
Physical characteristics
Possible inflammatory cells or abnormalities

This is one of the most important tests in male fertility evaluation, but it is not a definitive test of fertility or infertility.

Is WHO Reference Range a Fertility Cutoff?

No.

WHO reference values are not a strict boundary between fertile and infertile men. A man below the reference range may still father children, and a man within the range may still face infertility.

Semen results must be interpreted alongside:

Duration of trying for pregnancy
Age of both partners
Previous pregnancies
Female fertility status
Physical examination findings
Medical history and surgeries
Medications
Recent fever or illness
Sample collection quality
Abstinence period
Laboratory quality

WHO standards are designed to improve consistency, not to define absolute fertility.

Is One Semen Test Enough?

No.

Semen parameters can vary over time. Fever, infections, stress, medications, sample conditions, and abstinence duration can affect results.

If abnormal, a repeat test may be required. Timing depends on severity and clinical context.

How Can Varicocele Affect Sperm?

Effects vary among individuals, but possible mechanisms include:

Increased Testicular Temperature

Impaired venous drainage may reduce temperature regulation, affecting sperm production.

Oxidative Stress

Excess reactive oxygen species can:

Reduce motility
Damage sperm membrane
Impair function
Increase DNA damage

Altered Testicular Environment

Changes in blood flow may disrupt sperm production.

Semen Parameter Changes

Reduced concentration
Lower total count
Decreased progressive motility
Increased abnormal morphology

Can Varicocele Damage Sperm DNA?

In some men, varicocele is associated with increased sperm DNA fragmentation due to oxidative stress.

However, standard semen analysis does not measure DNA damage.

Sperm DNA fragmentation testing is not routinely recommended for all men.

According to the Abu Dhabi Department of Health, it may be considered in:

Unexplained infertility
Normal semen analysis with varicocele
Recurrent miscarriage
Repeated ART failure

Does Varicocele Affect IVF or Fertilization Failure?

Varicocele may contribute to sperm dysfunction but is not a confirmed direct cause of IVF failure.

IVF failure can occur due to:

Poor ovarian response
Low egg yield
Egg quality issues
Fertilization failure
Embryo arrest
Implantation failure
Pregnancy loss

Female factors, age, genetics, uterine conditions, and lab factors also play major roles.

Should Varicocele Be Treated Before IVF?

There is no universal answer.

Treatment may be considered when:

Clinical varicocele exists
Semen abnormalities are present
Time allows improvement before IVF

Key factors:

Female age
Ovarian reserve
Duration of infertility
Severity of sperm issue
Previous IVF failure
Time constraints

In older women or low ovarian reserve, delaying IVF for surgery may not be ideal.

Who May Benefit From Treatment?

Infertile couples
Clinical varicocele
Abnormal semen parameters
Confirmed female evaluation
Planned conception
Clinical judgment supporting benefit

Who Usually Does NOT Need Surgery?

Subclinical varicocele only on ultrasound
Normal semen analysis without infertility
No clinical varicocele
Expectation that surgery guarantees pregnancy
No infertility diagnosis

Treatment Options

Varicocelectomy

Surgical ligation of affected veins.

Microsurgical approach is often preferred when available due to:

Better vein identification
Preservation of arteries and lymphatics
Lower recurrence risk

Embolization

Minimally invasive radiological procedure blocking affected veins via catheter.

Choice depends on anatomy, expertise, and availability.

Does Treatment Guarantee Pregnancy?

No.

Outcomes depend on:

Age of both partners
Egg quality
Severity of sperm issue
Duration of infertility
Other causes
Treatment response

When to Recheck Semen After Surgery?

Sperm production takes ~3 months.

Follow-up is usually done after 3 months, sometimes longer.

Is Doppler Ultrasound Always Necessary?

No.

Physical examination is the first step. Ultrasound is used when needed for clarification.

Routine ultrasound is not recommended for all men.

Can Lifestyle Changes Cure Varicocele?

No.

But they may support fertility:

Stop smoking
Avoid drugs
Reduce heat exposure
Maintain healthy weight
Exercise
Sleep well
Manage chronic diseases

Do Antioxidants Help?

Evidence is mixed. Not all supplements are beneficial, and high doses may be unnecessary.

Questions to Ask Your Doctor

Is it clinical or ultrasound-only?
What grade is it?
Are semen tests standardized?
Should I repeat testing?
Which parameters are abnormal?
Is there a female factor?
What is success probability?
How long to wait?
Is delay risky?
Best treatment option?
If no surgery, next step?

When to Seek Infertility Evaluation?

After 12 months of unprotected intercourse (WHO definition), or earlier if:

Female age is high
Irregular cycles
Medical history
Known varicocele
Previous infertility signs
Recurrent miscarriage

Warning Symptoms Not to Ignore

Sudden severe testicular pain
Swelling
Fever
Nausea
Redness
Testicular mass

Fertility Should Be Evaluated as a Couple

WHO defines infertility as a condition affecting either partner.

Abu Dhabi health guidelines also recommend joint evaluation.

DLady is designed to support couple-based fertility tracking.

Conclusion

Varicocele may affect sperm in some men but does not always cause infertility.

WHO emphasizes:

Treatment decisions must be based on clinical findings
Benefit is most likely in infertile men with abnormal semen
Recommendations should not be overextended to IVF success

No single semen value defines fertility.

Best decisions consider both partners, test results, and clinical context.

Varicocele is a condition to evaluate—not a definitive verdict on fertility.

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