Medical illustration of normal testicular veins compared with enlarged veins associated with a varicocele.

Varicocele is an enlargement of veins inside the scrotum, the pouch of skin that holds the testicles. It develops when blood does not drain efficiently through the veins around a testicle. A varicocele is common, often occurs on the left side, and frequently causes no symptoms. When symptoms occur, they may include a dull ache, scrotal heaviness, visible or palpable enlarged veins, or discomfort that becomes more noticeable after standing or physical activity.

Some varicoceles are associated with reduced testicular growth, abnormal semen parameters or fertility problems, but many do not cause these complications. Diagnosis is usually based on a physical examination; scrotal Doppler ultrasound may be used when the examination is uncertain or further assessment is needed. Treatment is not necessary for every varicocele.

Varicocele Symptoms: Quick Overview

What Is a Varicocele?

Veins in the scrotum form a network called the pampiniform plexus. These veins help carry blood away from the testicles and also play a role in temperature regulation. A varicocele occurs when these veins become enlarged and tortuous because blood pools or flows backward (refluxes) instead of draining efficiently.

Varicoceles most often develop during puberty and are more common on the left. The left-sided pattern is related in part to differences in venous anatomy and drainage. A varicocele may be present on both sides, although a right-sided varicocele alone is less common and may require additional clinical assessment.

Common Varicocele Symptoms in Detail

1. Dull Scrotal Pain or Aching

The discomfort is typically described as a dull ache, dragging sensation or mild pressure rather than sudden sharp pain. It may become more noticeable after standing for a long time, exercise or late in the day. Lying down may ease it. However, not all scrotal pain is caused by a varicocele, so new or persistent pain should be examined.

2. Scrotal Heaviness or Fullness

Some people notice a feeling that one side of the scrotum is heavier. The sensation may fluctuate with posture and activity. It can be subtle and may not be accompanied by obvious swelling.

3. Enlarged, Twisted or Visible Veins

A larger varicocele may feel like a soft cluster of cords above or behind the testicle. Clinicians sometimes describe the texture as a “bag of worms.” Do not repeatedly squeeze or press the area to try to diagnose yourself; a healthcare professional can examine it safely.

4. Difference in Testicular Size

In some adolescents, the testicle on the affected side may remain smaller or grow more slowly. A difference in size needs clinical measurement and follow-up because normal development can also be uneven for a period of time.

5. Fertility or Semen-Quality Concerns

Varicocele is associated with abnormal semen parameters in some men. Possible effects include reduced sperm concentration or changes in sperm movement and shape. A varicocele does not automatically mean infertility, and fertility depends on both partners and many other factors.

6. No Noticeable Symptoms

Many varicoceles are asymptomatic. They may be detected during a routine physical examination, an evaluation for testicular size difference or an assessment for difficulty conceiving.

What Does Varicocele Pain Feel Like?

When pain is related to a varicocele, it is commonly a mild-to-moderate dull ache or heaviness. It may:

• Increase after long periods of standing or walking.
• Become more noticeable after strenuous activity.
• Feel worse toward the end of the day.
• Improve when lying down or resting.
• Occur with a sense of fullness or enlarged veins above the testicle.

Varicocele Grades: How Doctors Classify It

Clinicians commonly describe a palpable varicocele by grade. A separate category, subclinical varicocele, refers to veins that are not felt on examination but are detected by imaging.

The grade alone does not determine whether treatment is needed. Pain, testicular size, semen analysis, fertility goals and examination findings all matter.

What Causes Varicocele?

The exact reason a varicocele develops is not always clear. It is generally linked to inefficient venous drainage or backward flow through veins around the testicle. Differences in the way the left and right testicular veins drain help explain why varicoceles occur more often on the left side.

Varicocele is not caused by sexual activity, masturbation, cycling or lifting weights in a simple direct way. Activities may make an existing ache more noticeable, but they should not be assumed to be the underlying cause.

Risk Factors and Who May Develop It

• Puberty and adolescence: Varicoceles often become more noticeable during the rapid growth of puberty.
• Venous anatomy: The drainage pathway of the left testicular vein makes left-sided varicocele more common.
• Family or individual predisposition: Some anatomical and biological factors may contribute, but no single cause explains every case.
• Adult age: A varicocele may persist from adolescence or be identified for the first time in adulthood.

There is no reliable home screening test. If you notice a new lump, swelling, persistent ache or a difference in testicular size, arrange a medical examination.

Can Varicocele Affect Fertility?

Varicocele is associated with male subfertility in some men, but the relationship is not identical for everyone. Researchers have proposed that altered blood flow may raise scrotal temperature, affect oxygen delivery and expose testicular tissue to substances that interfere with normal function. These mechanisms are still being studied.

Some men with varicocele have normal sperm production and father children without difficulty. Others may have reduced sperm concentration or other semen abnormalities. A semen analysis is generally considered when fertility is a concern, rather than assuming fertility status from the appearance or grade of a varicocele.

How Is Varicocele Diagnosed?

1. Medical History

The clinician may ask when symptoms began, whether pain changes with standing or activity, whether there has been swelling or injury, and whether fertility is a concern. They may also ask about previous groin surgery, infections or other medical conditions.

2. Physical Examination

The scrotum is usually examined while standing and sometimes while lying down. The clinician may ask the patient to bear down (Valsalva manoeuvre) to make refluxing veins easier to feel. Both testicles are assessed for size, position, tenderness and other abnormalities.

3. Scrotal Doppler Ultrasound

Ultrasound can show enlarged veins, blood-flow direction and testicular size. It is particularly useful when the physical examination is unclear, symptoms persist or another cause of scrotal swelling needs to be considered. It should support—not replace—a proper clinical assessment.

4. Semen Analysis

For men being evaluated for infertility, semen analysis helps assess sperm concentration, movement and shape. Results may need repeating because semen parameters can vary. A varicocele grade alone cannot tell whether sperm quality is affected.

5. Further Assessment in Selected Cases

An isolated right-sided clinical varicocele, a varicocele that appears suddenly, or one that does not reduce when lying down may prompt the clinician to consider further assessment for an underlying abdominal or retroperitoneal cause. Imaging decisions depend on the person's age, examination and clinical context; routine abdominal imaging is not required for every small or moderate right-sided varicocele.

Varicocele Treatment Options

Not every varicocele needs treatment. If there is no significant pain, testicular growth problem or fertility-related indication, observation and periodic review may be appropriate. Treatment decisions should be made with a urologist or andrologist after discussing symptoms, examination, semen results and reproductive goals.

1. Observation and Follow-Up

Many people with a varicocele do not need an operation. A clinician may monitor symptoms, testicular size or semen parameters depending on age and circumstances. Follow-up is especially important in adolescents when testicular growth is being assessed.

2. Supportive Measures for Mild Discomfort

• Wear supportive underwear if it reduces scrotal dragging or discomfort.
• Take breaks from prolonged standing if it reliably worsens symptoms.
• Temporarily modify activities that aggravate pain, then discuss a safe return to exercise.
• Ask a clinician or pharmacist whether an over-the-counter pain reliever is suitable for you, especially if you have other medical conditions or take regular medicines.

These measures may ease discomfort but do not make enlarged veins disappear or prove that the underlying condition has resolved.

3. Varicocelectomy (Surgical Repair)

Varicocelectomy is a procedure to close or tie off the abnormal veins so blood is redirected through healthy drainage pathways. Microsurgical inguinal or subinguinal repair is one commonly used approach. Other surgical approaches may be selected according to the surgeon's expertise and the patient's anatomy.

In selected men with infertility, a palpable varicocele and abnormal semen parameters, repair may improve semen quality and the chance of pregnancy. Improvement is not guaranteed, and the time course can take months. Pain may improve after repair, but persistent or recurrent pain is possible.

4. Varicocele Embolization

Embolization is a minimally invasive radiological procedure. A specialist passes a thin catheter through a blood vessel and blocks the abnormal testicular vein using coils or another occluding material. It avoids a conventional surgical incision, but suitability, recurrence risk and potential complications should be discussed with the interventional radiologist.

5. When Is Treatment Considered?

• Persistent scrotal pain that is consistent with varicocele after other causes have been assessed and conservative measures have not helped.
• Infertility in a couple when the male partner has a palpable clinical varicocele and abnormal semen parameters, after a full fertility evaluation.
• Persistent testicular size difference or impaired growth in an adolescent, confirmed on repeat assessments.
• Selected cases with other testicular or reproductive factors, after specialist review.

Repair is generally not recommended for an imaging-only (subclinical) varicocele or simply because a varicocele is present when semen analysis is normal and there is no other indication.

Possible Complications and Limits of Treatment

Varicocele itself may be associated with testicular growth changes, abnormal semen parameters or discomfort in some patients. Many people never develop these problems.

After surgery or embolization, possible complications include recurrence or persistence of the varicocele, hydrocele (fluid around the testicle), infection, bleeding, pain, injury to nearby structures or a reaction to embolization materials. The risk profile differs by procedure and individual factors. Ask the treating specialist about their experience and the expected follow-up plan.

Varicocele in Teenagers and Adolescents

Varicocele is often first identified during puberty. Many adolescents do not need immediate treatment. Current EAU paediatric guidance recommends considering repair when a smaller testicle on the affected side is persistent and confirmed on two visits about six months apart, with a difference greater than 2 mL or 20%. Treatment may also be considered case by case for symptoms, bilateral palpable varicoceles or abnormal semen quality in older adolescents.

Because testicular growth can vary during puberty, a single measurement should not automatically lead to surgery. A paediatric urologist can explain whether observation, repeat measurement or treatment is appropriate.

When Is Testicular Pain an Emergency?

Arrange prompt clinical review for a new lump, persistent swelling, ongoing ache, a change in testicular size, fever with scrotal pain, urinary symptoms or a newly noticed right-sided varicocele.

Frequently Asked Questions About Varicocele Symptoms

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Trusted Medical Sources and Further Reading

• Mayo Clinic: Varicocele — Symptoms and Causes — overview, symptoms and common effects.
• Mayo Clinic: Varicocele — Diagnosis and Treatment — clinical evaluation and treatment options.
• AUA/ASRM: Diagnosis and Treatment of Infertility in Men (2024 amendment) — indications for varicocele repair in men with infertility.
• European Association of Urology (EAU): Male Infertility Guideline — clinical classification, diagnosis and treatment recommendations.
• EAU: Varicocele in Children and Adolescents — assessment and treatment considerations in younger patients.

Conclusion: Recognise the Symptoms and Get the Right Assessment

Varicocele symptoms can include a dull scrotal ache, heaviness, visible or palpable enlarged veins and, in some cases, testicular size or fertility concerns. However, many varicoceles cause no symptoms and never require treatment. A physical examination, and sometimes Doppler ultrasound or semen analysis, helps determine whether the condition is clinically important.

Do not ignore a new lump, persistent pain or testicular size change. Most importantly, sudden severe testicular pain requires emergency assessment because it may be testicular torsion rather than varicocele. A urologist can help decide whether observation, supportive care, surgery or embolization is appropriate.

Medical disclaimer: This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. Scrotal pain, swelling, lumps and fertility concerns require individual assessment by a qualified healthcare professional. Do not self-diagnose or delay emergency care for sudden severe testicular pain. Treatment decisions should be made with a urologist or andrologist based on examination, imaging and fertility goals.