Hydrocele Guide: Symptoms, Causes, and Treatment
A hydrocele is a usually harmless fluid-filled swelling around one or both testicles, common in infants and adult men. This guide explains what causes hydroceles, how they are diagnosed, and your treatment and management options.
Most hydroceles are benign and don’t require urgent treatment, though they can cause uncomfortable scrotal swelling. Diagnosis is typically confirmed with a physical exam and scrotal ultrasound. Treatment ranges from watchful waiting for mild cases to a minor surgical procedure for persistent or painful hydroceles.
Overview
A hydrocele is a non-cancerous, fluid-filled sac that forms around one or both testicles, causing the scrotum to swell. It is very common in newborn infants (often resolving on its own by age 1) and in adult men over 40, and is almost never a sign of testicular cancer. While most hydroceles are harmless and don’t cause pain, larger ones can lead to discomfort, heaviness, or embarrassment, and it’s important to have any scrotal swelling evaluated by a healthcare provider to rule out other more serious conditions.
Signs & Symptoms
The most common sign of a hydrocele is painless, visible swelling of the scrotum. The swelling often feels smooth and fluid-filled when touched, and may change size throughout the day. Common symptoms include:
- Painless, swollen scrotum that may feel like a fluid-filled sac
- A feeling of heaviness or dragging in the scrotum, especially with larger hydroceles
- Mild discomfort or pain if the hydrocele is very large
- Rarely, redness, warmth, or tenderness if the hydrocele becomes infected (requires prompt medical care)
Causes & Risk Factors
Hydroceles form when the body produces more fluid around the testicle than it can drain away. In infants, they most often occur when a small channel that allowed the testicles to descend into the scrotum before birth doesn’t close properly, letting fluid leak into the scrotum. In adult men, hydroceles can develop due to inflammation, injury, or prior scrotal/groin surgery. Common risk factors include:
- Being an infant (most congenital hydroceles resolve by age 1)
- Being an adult man over 40
- History of scrotal injury or trauma
- Inflammation or infection of the testicle or epididymis (the tube that stores sperm)
- Prior scrotal or groin surgery, including vasectomy or hernia repair
Diagnosis
Your healthcare provider will diagnose a hydrocele with a physical exam of the scrotum first. They may use transillumination, a quick test where a light is shone through the swollen scrotum to check for fluid (fluid will glow, while solid masses will not). A scrotal ultrasound, a painless imaging test using sound waves, is almost always ordered to confirm the diagnosis and rule out other causes of swelling like hernias, cysts, or tumors.
Treatment & Management
Most small, painless hydroceles don’t require treatment and may go away on their own, especially in infants. Your provider may recommend watchful waiting with regular check-ups to monitor size. If the hydrocele is large, causes pain, or leads to complications, treatment options include:
- Aspiration: A provider uses a thin needle to drain fluid from the hydrocele in an office procedure. Fluid often returns, so this is usually only for people who can’t have surgery.
- Hydrocelectomy: A minor outpatient surgery to remove the hydrocele sac and drain fluid. This is the most effective long-term treatment, with a low risk of recurrence.
| Treatment Option | Best For | Recovery Time | Risks |
|---|---|---|---|
| Watchful Waiting | Small, painless hydroceles in infants or adults | No recovery time; check-ups every 6-12 months | Minimal; rare risk of growth or discomfort |
| Aspiration | Adults unable to have surgery | 1-2 days of mild soreness; avoid heavy activity for 3 days | High risk of fluid recurrence; rare infection or bleeding |
| Hydrocelectomy | Large, painful, or persistent hydroceles | 2-4 weeks to normal activity; avoid heavy lifting for 4-6 weeks | Rare risks: infection, bleeding, swelling, or hydrocele recurrence (5-10% of cases) |
Living With It
Most people with small, uncomplicated hydroceles can live normal, active lives with no special restrictions. If you have a larger hydrocele or are recovering from surgery, simple adjustments can help reduce discomfort and support healing. Your provider will give you personalized guidance based on your specific case.
Medical Review Team
WellAlly Medical Editorial Team
This content is not a replacement for professional medical advice.
Recovery & management timeline
0
Day of Surgery
Rest at home, apply ice packs to the scrotum for 15-20 minutes at a time to reduce swelling, wear supportive snug underwear, and avoid all strenuous activity.
1-7
First Week Post-Surgery
Continue resting, avoid lifting anything heavier than 10 pounds, take prescribed pain medication as needed, keep the surgical site clean and dry, and watch for signs of infection like fever, redness, or worsening pain.
8-21
2-3 Weeks Post-Surgery
Gradually return to light daily activities as tolerated, continue wearing supportive underwear, and attend your follow-up appointment to check healing. Mild swelling or discomfort is normal during this time.
22-42
4-6 Weeks Post-Surgery
Most people can return to normal exercise and heavy lifting at this point once your provider confirms healing is complete. Swelling will continue to decrease gradually over the next 1-2 months.
Self-care steps
1Wear supportive underwear
Choose snug, supportive briefs (rather than loose boxers) to reduce scrotal dragging and discomfort, especially if you have a large hydrocele or are recovering from hydrocelectomy surgery.
2Apply cold packs for swelling
If you have discomfort or swelling, apply a clean ice pack wrapped in a thin cloth to the scrotum for 15-20 minutes at a time, 3-4 times a day, for the first few days after surgery or if swelling worsens.
3Avoid heavy lifting and strenuous activity
For 4-6 weeks after hydrocelectomy, avoid lifting anything heavier than 10 pounds, intense exercise, or contact sports to prevent injury to the surgical site. For uncomplicated hydroceles, avoid activities that cause direct scrotal trauma.
4Monitor for changes in swelling or pain
Check your scrotum daily for changes in size, redness, warmth, or new pain. If you notice sudden swelling, severe pain, or signs of infection, contact your healthcare provider right away.
5Practice gentle scrotal hygiene
Wash the scrotal area gently with mild, fragrance-free soap and warm water daily, and pat dry thoroughly to reduce the risk of skin irritation or infection, especially if you have a large hydrocele that makes cleaning more difficult.
When to seek medical help
Seek urgent or emergency medical care immediately if you experience sudden, severe scrotal pain; rapid, painful swelling of the scrotum; redness, warmth, or tenderness of the scrotum; fever; or nausea and vomiting. These symptoms can be signs of a twisted testicle (testicular torsion), infected hydrocele, or other serious scrotal condition that requires immediate treatment to prevent permanent damage.
Frequently asked questions
Are hydroceles cancerous?
Can hydroceles go away on their own?
Is hydrocelectomy surgery safe?
Will a hydrocele affect my fertility?
Sources
- 1Mayo Clinic - HydroceleSource
- 2NHS - HydroceleSource
- 3
- 4
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Medical Editorial Team · Last reviewed October 9, 2026. · Read our editorial policy