Hydrocele: A Comprehensive Guide
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 24th, 2026.
Published on April 4th, 2026. Updated on August 28th, 2026.
Key Takeaways
Hydrocele is a fluid-filled sac around the testicle that causes scrotal swelling
Most common in newborns and older men over 40 years old
Usually painless but can cause discomfort from size and weight
Often resolves on its own in babies within the first year of life
Surgery is the most effective treatment for persistent or large hydroceles
Overview
A hydrocele is a collection of fluid that builds up around one or both testicles. This fluid accumulates in a thin sac called the tunica vaginalis, which normally surrounds each testicle. The condition causes the scrotum to swell and appear larger than normal.
Hydroceles are most common in newborn babies and men over 40. About 1-2% of newborn boys are born with this condition. In babies, hydroceles often disappear on their own as the body absorbs the excess fluid. Adult hydroceles usually develop gradually and may require treatment if they become large or uncomfortable.
While hydroceles are generally harmless, they can cause concern due to the visible swelling. Understanding this condition helps you know when to seek medical care and what treatment options are available. The good news is that most hydroceles are not dangerous and don't affect your health or fertility. Many people live with a hydrocele for years without any serious problems. Getting the right information helps you make the best decisions about your care.
Symptoms & Signs
Hydroceles typically develop slowly and may not cause obvious symptoms at first. The main sign is swelling in the scrotum that may affect one or both sides.
Primary Symptoms
Scrotal swelling - The scrotum appears enlarged and may feel heavy or full
Painless mass - A soft, fluid-filled sac that can be felt around the testicle
Feeling of heaviness - The affected side may feel weighted down or uncomfortable
Size changes - Some hydroceles, especially communicating hydroceles, may become larger during the day and smaller when lying down. A changing groin or scrotal bulge can also be caused by a hernia and should be evaluated.
When to Seek Care
Seek emergency medical care for sudden scrotal pain or rapid swelling. Contact a healthcare provider promptly for redness or warmth, particularly if you also have a fever. These signs could indicate other serious conditions that need immediate attention. A quick doctor visit can help rule out more serious problems like infections or testicular issues. Don't ignore sudden pain or warmth in the area. It's better to get checked out and find out everything is fine than to wait and worry.
When to Seek Immediate Care
Seek emergency medical care for sudden or severe scrotal pain or swelling, especially if you also have nausea or vomiting. These symptoms can occur with testicular torsion, which requires urgent treatment. Fever, redness, or warmth also needs prompt medical evaluation because it may indicate infection.
Causes & Risk Factors
Hydroceles can develop for different reasons depending on your age. In babies, they usually form during normal development in the womb. In adults, they often result from injury or inflammation.
During fetal development, the testicles form in the abdomen and move down into the scrotum. A small tube called the processus vaginalis usually closes before birth. When it doesn't close properly, fluid can accumulate and cause a hydrocele. Hydrocele in babies occurs in about 1-2% of newborns.
In adults, hydroceles may develop after injury to the scrotum, infection, or inflammation. Sometimes the cause is unknown. The condition can also occur after hernia repair surgery or other procedures in the groin area. Sometimes the cause is unknown. New scrotal swelling should still be evaluated to confirm the diagnosis and check for an underlying condition. New scrotal swelling should still be evaluated to confirm the diagnosis and check for an underlying condition.
Age
Most common in newborns and men over 40 years old
Genetics
Some developmental conditions can increase the risk of hydrocele in babies, but many hydroceles occur without a known risk factor.
Lifestyle
Heavy lifting or straining may make swelling from a communicating hydrocele or inguinal hernia more noticeable, but it is not a well-established cause of most hydroceles.
Other Conditions
Previous infections, injuries, or surgeries in the groin area
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Diagnosis
Healthcare providers can usually diagnose a hydrocele through a physical examination. The process is straightforward and helps rule out other conditions that cause scrotal swelling.
Medical History & Physical Examination
Your doctor will ask about when you first noticed the swelling, any pain or discomfort, and whether the size changes throughout the day. They'll also ask about any recent injuries, infections, or surgeries in the groin area.
During the physical exam, your doctor will carefully examine your scrotum and testicles. They may use a technique called transillumination, where they shine a light through the scrotum. A fluid-filled hydrocele often allows light to pass through, while many solid masses do not. Transillumination is not definitive, so ultrasound may be needed when the diagnosis is uncertain or the testicle cannot be examined clearly.
Diagnostic Testing
Ultrasound - Uses sound waves to create images of the scrotum and confirm fluid collection
Blood tests - May check for signs of infection or inflammation if needed
Urine analysis - Helps rule out urinary tract infections that could cause similar symptoms
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Treatment Options
Treatment for hydroceles depends on the patient's age, symptoms, and size of the fluid collection. Many hydroceles don't require immediate treatment, especially in babies.
Conservative Treatments
Watchful waiting - Many hydroceles resolve on their own, especially in babies under one year
Pain management - Over-the-counter pain relievers may help mild discomfort if they are safe for you; follow the label or ask a healthcare professional. Sudden or severe pain needs urgent evaluation rather than self-treatment.
Supportive underwear - Well-fitting briefs or scrotal support may provide comfort
Advanced Treatments
Hydrocelectomy - Surgical removal of the hydrocele sac when conservative treatment isn't effective
Needle drainage - A clinician may drain the fluid in selected people who are not good candidates for surgery, but recurrence is common and infection or bleeding can occur.
Sclerotherapy - Injection of medication to prevent fluid from returning after drainage
Your doctor will help you choose the best treatment based on your situation. If your hydrocele isn't causing problems, your doctor might say it's okay to just watch it for now. If it's uncomfortable or getting bigger, surgery is usually the best long-term solution.
Living with the Condition
Most people with hydroceles can maintain normal daily activities with minor adjustments. The key is managing any discomfort and monitoring for changes in size or symptoms.
Daily Management Strategies
Wear supportive underwear to reduce discomfort and provide gentle compression. Avoid heavy lifting or straining when possible, as this can worsen symptoms. Apply ice packs for short periods if you experience discomfort, but avoid direct contact with skin. Keep the area clean and dry to prevent infections that could complicate the condition.
Many people find that lying down helps the swelling feel better since gravity works against them when standing up. Taking warm baths can soothe any discomfort you might feel. Staying hydrated and eating healthy foods also helps your body work better overall.
Exercise & Movement
Light to moderate exercise is usually safe with a hydrocele. Swimming, walking, and gentle stretching are good options. Avoid contact sports or activities that could cause injury to the groin area. Listen to your body and stop any activity that causes increased pain or discomfort.
Most people with hydroceles can return to normal exercise routines without problems. Talk to your doctor if you're unsure whether a specific activity is safe for you. Staying active actually helps your overall health and can improve how you feel.
Prevention
While you cannot always prevent hydroceles, especially those present at birth, some measures may reduce your risk of developing them later in life.
Protect your groin area during sports and physical activities with appropriate gear
Seek prompt treatment for any groin infections or inflammatory conditions
Avoiding excessive straining can support general health, but it has not been shown to prevent most hydroceles.
Seek medical care for symptoms of a groin, urinary, or genital infection. Routine hygiene is healthy but cannot reliably prevent hydroceles.
If you experience groin discomfort or swelling, seek medical evaluation promptly.
Frequently Asked Questions
Hydroceles typically don't affect fertility directly. However, large hydroceles might make it difficult to examine the testicles properly during medical checkups. A hydrocele itself usually does not impair fertility, but an underlying condition affecting the testicle or epididymis may affect reproductive health. New swelling should be evaluated to confirm its cause.
Some hydroceles remain stable in size while others may gradually increase. Adult hydroceles are more likely to persist or grow compared to those in babies. Regular monitoring helps track any changes.
Surgery isn't always required. Many hydroceles in babies resolve naturally within the first year. Adults may choose surgery if the hydrocele is large, uncomfortable, or affects daily activities.
Hydroceles can return, especially after needle drainage procedures. Surgical removal (hydrocelectomy) has a lower recurrence rate. Your doctor will discuss the best treatment option based on your specific situation.
Complications are rare but can include infection or injury to nearby structures during surgery. Large hydroceles might make it harder to detect testicular problems during self-examinations, which is why regular medical checkups are important.
Still have questions?
Consult with a healthcare professional for personalized advice.