Testicular & Scrotal Conditions & Male Infertility
Hydrocoele
A hydrocoele is a painless build-up of fluid around one or both testicles. While usually harmless, it causes a swollen scrotum and a feeling of heaviness. It is common in newborns and older men and is easily diagnosed with a simple ultrasound.
Key Takeaways
- A hydrocoele is a painless build-up of fluid around one or both testicles. While usually harmless, it causes a swollen scrotum and a feeling of heaviness. It is common in newborns and older men and is easily diagnosed with a simple ultrasound.
- We offer specialist diagnostics and treatments. Book a consultation to discuss your options.
Clinical Overview
Understanding Hydrocoele
A hydrocoele (pronounced hydro-seel) is a collection of watery fluid in the sac that surrounds your testicle. Normally, there is just a tiny amount of fluid there to let the testicle move smoothly. However, if your body produces too much fluid or doesn't absorb it properly, it builds up and causes a noticeable swelling in the scrotum.
In adults, most hydrocoeles are "non-communicating." This means the sac is sealed, but it has overfilled with fluid—often due to a minor injury, an infection, or general inflammation. Some people have a "communicating" hydrocoele, where there is a tiny opening between the tummy (abdomen) and the scrotum, allowing fluid to flow back and forth.
While a hydrocoele isn't a "danger" to the testicle itself, the size can make daily life uncomfortable. The main goal of seeing a specialist is to make sure the fluid isn't "masking" another issue. Because the fluid can make it hard for a doctor to feel the testicle properly, an ultrasound is usually used to check that everything underneath is healthy.
What to Look For
Symptoms, Causes & Risk Factors
01
Common Symptoms
Painless swelling: You might notice one or both sides of your scrotum looking much larger than usual.
A "dragging" sensation: A feeling of heaviness or pressure in the groin, especially if the hydrocoele is large.
Bulky discomfort: It rarely causes sharp pain, but the size can make sitting or walking feel awkward.
Variable firmness: The swelling might feel soft and squishy like a water balloon, or quite tense and firm.
Changing size: If you have the "communicating" type, you might notice the swelling gets bigger during the day when you are active and smaller when you are lying down at night.
02
When to Seek Help
Sudden swelling: If your scrotum swells up rapidly over a few hours, you must see a doctor immediately to rule out more urgent issues like a twisted testicle (torsion).
Pain or redness: If the swelling is accompanied by heat, redness, or a fever, it could be an infection.
Inability to feel the testicle: If the fluid is so tense that you can no longer feel the shape of the testicle underneath.
Interference with life: If the size is making it difficult to walk, sit comfortably, or wear your usual clothes.
03
Potential Causes
Inflammation or infection: Conditions like epididymo-orchitis can trigger fluid build-up.
Minor injury: A direct blow or "knock" to the scrotum.
Post-surgery: Occasionally, fluid can build up after other groin surgeries, such as hernia repairs.
Developmental factors: In babies, the tube between the tummy and the scrotum (processus vaginalis) may fail to close properly.
Fluid imbalance: Sometimes the lining of the sac simply stops absorbing fluid at the normal rate.
04
Risk Factors
Age: They are very common in newborn boys (usually clearing up within a year) and in men over 40.
Groin trauma: Any significant injury to the testicles.
History of infection: Previous STIs or infections like mumps can increase the risk.
Previous pelvic surgery: Past operations in the groin area can sometimes disrupt the natural drainage of fluid.
Importance of Diagnosis
Why Early Diagnosis Matters
Getting a clear diagnosis is important because it helps your doctor "see through" the fluid. A large hydrocoele acts like a shield, making it difficult for a GP to perform a manual check. By using a quick, painless ultrasound, doctors can confirm that the underlying testicle is healthy and that there are no hidden tumours or hernias.
Identifying the specific type of hydrocoele also changes how we treat it. For example, a hydrocoele in a younger man might be linked to a small hernia, which requires a different surgical approach than a standard adult hydrocoele. Accurate diagnosis means you won't undergo unnecessary surgery for small collections of fluid that aren't causing any problems.
Importance of Diagnosis
Diagnostic Options & Investigations
To accurately identify the cause of your symptoms, our specialists use a range of targeted investigations. Explore the diagnostic tests below to understand how we confirm a diagnosis and plan your recovery.
Living With Condition
Living With Hydrocoele
- Observation & Reassurance
- Lord’s Procedure
- Jaboulay Procedure
- Surgical Hernia Repair
- Sclerotherapy
Many men live with a small hydrocoele for years without needing any treatment at all. If it isn't painful and you aren't bothered by the appearance, your doctor will likely suggest "conservative management"—which essentially means keeping an eye on it. A great tip for comfort is to wear supportive underwear (briefs or "trunk" styles) rather than loose boxers. This helps take the "weight" off the scrotum and prevents that dragging feeling.
You might wonder if the fluid can just be "drained" with a needle. UK specialists generally discourage this (called aspiration). This is because the fluid almost always comes back within a few weeks, and every time a needle is used, there is a risk of introducing an infection. Surgery is the only permanent solution for a bothersome hydrocoele.
If you do choose surgery, the recovery is usually straightforward. It is normal for the area to remain a bit swollen for a few weeks after the operation while the internal layers heal. We usually advise patients to avoid heavy lifting and strenuous exercise for about 2–4 weeks to ensure everything seals up correctly and the fluid doesn't return.
Short-Term Complications
03- Appearance concerns: Feeling self-conscious about the visible swelling.
- Skin irritation: Larger swellings can cause the skin to rub against your thighs, leading to chafing.
- Physical restriction: Discomfort when exercising or during physical intimacy.
Long-Term Complications
04- Infected fluid: In rare cases, the fluid can become infected (known as a pyocoele).
- Hardening (Calcification): Over many years, the sac can become thick and hard, making it feel like a firm shell.
- Hernia risk: "Communicating" hydrocoeles can sometimes lead to an inguinal hernia if the opening to the abdomen widens.
- Pressure: In extreme cases, a very tense hydrocoele can put pressure on the testicle, though this is very rare.
Treatment Options
Treatment Options & Care Pathways
Explore the specialist interventions available for Hydrocoele. We offer a range of evidence-based treatments designed to address your specific symptoms, focusing on long-term recovery and your personal health goals.
Specialists
Our specialists for Hydrocoele
Leading experts for this condition. View profiles to see clinical backgrounds and current availability.
Mr. James ArmitageConsultant Urologist
Mr. Nimish ShahConsultant Urological Surgeon
Professor Christof KastnerAssociate Professor & Consultant Urologist
Mr. Oliver WisemanConsultant Urologist
Mr. Kasra Saeb-ParsyConsultant Urological Surgeon
Mr. David ThurtleConsultant Urological Surgeon
Professor John KellyConsultant Urological Surgeon
Mr. Laurian DragosConsultant Urologist
Mr. Tev AhoConsultant UrologistOur Commitment
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Every step of your care is delivered to the same standard: senior consultants, a personalised plan, and the safety of an accredited private hospital behind you.
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Receive evidence-based care delivered by senior NHS consultants in a professional, specialist setting.
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Patient Guidance
Frequently Asked Questions
Common questions about specialist referrals and consultations.
3 questions
No, a hydrocoele is a benign collection of fluid and cannot become cancerous. However, a hydrocoele can sometimes be *caused* by an underlying testicular tumour. This is why urologists always perform an ultrasound—not because they think the fluid is dangerous, but to ensure the testicle hiding behind the fluid is healthy.
Reviewed 2 Mar 2026
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While we can drain a hydrocoele with a needle (aspiration), the fluid almost always comes back because the sac that produces the fluid is still there. Furthermore, sticking a needle into the scrotum carries a risk of infection or bleeding. Surgery is preferred because it involves removing or 'turning inside out' the sac itself, which provides a permanent cure.
Reviewed 2 Mar 2026
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A standard hydrocoele does not affect the testicle's ability to produce sperm or testosterone. It is located in a sac *around* the testicle, not inside it. Only in very extreme, rare cases where the hydrocoele is massive and under high pressure could it potentially affect blood flow to the testicle, but for the vast majority of men, it is purely a comfort and cosmetic issue.
Reviewed 2 Mar 2026
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