A varicocele is an enlargement of the veins around the testicle. It is common and may cause no symptoms, but in some men, it can affect sperm production and fertility.
Having a varicocele does not automatically mean you will have fertility problems. Its impact can depend on factors such as sperm health, testicular function, and the size of the varicocele.
This guide explains how varicocele affects fertility, including its causes, effects on sperm health, grades, diagnosis, and treatment options.
A varicocele is a group of enlarged veins in the scrotum, the sac of skin that holds the testicles. It happens when blood does not flow properly through these veins and starts to build up.
Varicoceles often develop during puberty and usually occur on the left side. Many do not cause problems and do not need treatment.
However, some varicoceles can cause scrotal discomfort, testicular shrinkage, lower sperm production, or fertility problems.
The testicles need the right temperature and blood flow to make healthy sperm. A varicocele can sometimes affect this environment and interfere with normal sperm production.
However, having a varicocele does not automatically mean infertility. Many men with varicoceles can have children without treatment.
The risk of fertility problems may be higher when a man has a varicocele that can be felt during an exam, difficulty conceiving, and abnormal semen analysis results.
A varicocele may affect fertility in several ways:
Because male fertility can have multiple causes, a varicocele should not automatically be assumed to be the only reason for difficulty conceiving.
One main concern is its effect on semen quality. A semen analysis can measure sperm concentration, movement, and morphology.
Men with clinically significant varicoceles may have:
Sperm production can vary from one semen analysis to another, so doctors may recommend repeat testing before making treatment decisions.
The exact mechanism is not completely understood. Several factors may work together, including:
These changes may interfere with sperm production and sperm quality.
Many varicoceles do not cause symptoms. When symptoms occur, they may include:
Scrotal pain, swelling, or a new lump should be evaluated because several conditions can cause similar symptoms.
A gynaecology clinic usually begins with a physical examination.
The scrotum may be examined while standing and lying down, and the doctor may ask you to perform a Valsalva maneuver to make the veins easier to detect.
A scrotal ultrasound with Doppler may be used when the diagnosis is uncertain or when another condition needs to be ruled out.
Fertility evaluation may also include semen analysis and, depending on the situation, hormone or other testing.
Varicoceles are commonly classified according to how easily they can be detected during examination.
A Grade 1 varicocele is small and usually not visible. It may only become noticeable when you perform a Valsalva maneuver.
A Grade 1 varicocele does not automatically mean reduced fertility. Treatment decisions generally depend on symptoms, fertility goals, semen results, and other clinical findings.
A Grade 2 varicocele can usually be felt during a physical examination without requiring a Valsalva maneuver, although it may not be visible.
Its presence alone does not establish male infertility. Semen quality and the overall fertility evaluation are important when deciding whether treatment is appropriate.
A Grade 3 varicocele is the largest clinical grade and may be visible as well as easily palpable.
Larger varicoceles can be associated with testicular changes and abnormal semen parameters, but grade alone does not determine fertility. Doctors consider the complete clinical picture rather than treating based only on size.
In selected men, treating a clinical varicocele can improve semen parameters and may improve the chance of pregnancy.
The AUA/ASRM male infertility guideline recommends considering surgical varicocele repair for men who are trying to conceive, have a palpable varicocele, have infertility, and have abnormal semen parameters, with specific clinical exceptions.
However, treatment does not guarantee pregnancy. Fertility depends on both partners and can be affected by many other factors.
Treatment for a varicocele depends on its symptoms, severity, and impact on fertility, with options including monitoring, surgery, and embolization.
Varicocelectomy is a surgical procedure that closes or redirects blood flow through the enlarged veins while preserving normal circulation to the testicle.
Microsurgical approaches are commonly used because they allow the surgeon to identify and preserve important structures.
After treatment, sperm production may improve, but the response varies between individuals.
Varicocele embolization is a minimally invasive procedure performed by an interventional radiologist. A catheter is guided into the affected vein, where materials are used to block abnormal blood flow.
It can be an alternative to surgery in selected patients. The most appropriate approach depends on the anatomy of the varicocele, previous treatments, fertility goals, and specialist assessment.
Not every varicocele needs treatment. If there are no significant symptoms or fertility concerns, a doctor may recommend observation.
For men concerned about fertility, monitoring can include:
This approach avoids unnecessary treatment when there is no clear indication for repair.
If pregnancy does not occur naturally, assisted reproductive technology (ART) may be considered.
Depending on sperm quality and the couple’s circumstances, options can include intrauterine insemination (IUI) or in vitro fertilization (IVF).
Some men undergo varicocele treatment before ART, particularly when they have a clinically significant varicocele and abnormal semen parameters.
The decision should be individualized rather than assuming that varicocele repair is necessary before every fertility treatment.
A varicocele does not necessarily cause permanent infertility. Some men with varicoceles have normal fertility, while others develop measurable changes in sperm production.
When a varicocele is contributing to abnormal semen quality, treatment may improve sperm production or movement in some men.
However, fertility outcomes vary, and treatment cannot guarantee that natural conception will occur.
Consider speaking with a gynaecologist specializing in male fertility or a fertility-specialised clinic if:
Male fertility evaluation is often most useful when both partners are assessed rather than focusing on one possible cause alone.
A varicocele does not always cause infertility. However, in some men, it can affect sperm production, sperm movement, and overall sperm health.
Doctors may use a physical exam, ultrasound, and semen analysis to evaluate a varicocele. Treatment options include varicocelectomy, embolization, or regular monitoring.
The best approach depends on your symptoms, sperm health, fertility goals, and other factors. A male fertility specialist can help determine whether treatment is needed.
