Navigating Fluid Build-Up: A Urologist’s Guide to Adult Hydroceles

Q: "What should I expect during surgical recovery?"

Hydrocelectomy is an outpatient procedure, meaning you go home the very same day. However, scrotal tissue is naturally soft and prone to swelling, so properly managing your recovery is crucial:

Dr. Sarp Korcan Keskin
Aug 6
4 min read

By Prof. Keskin, Consultant Urological Surgeon

Noticing a sudden or gradual enlargement in your scrotum can be a frightening experience. Many of my patients walk into my clinic quietly fearing the worst—often worrying that a swollen testicle means testicular cancer.

Fortunately, one of the most common causes of non-painful scrotal swelling in adult men is a benign, treatable condition called a hydrocele.

A hydrocele is a painless collection of clear fluid surrounding one (or occasionally both) of the testicles, causing the scrotum to swell. While it is rarely dangerous, it can grow to a size that causes significant physical heaviness, chafing, and emotional distress.

In this guide, I will break down everything you need to know: what causes a hydrocele, when it needs treatment, the ups and downs of surgery vs. needle drainage, and what to expect during recovery.

"Why did I develop a hydrocele?"

To understand a hydrocele, it helps to know a little bit about basic anatomy.

Your testicles sit inside a smooth protective sac called the tunica vaginalis. Normally, this sac produces a tiny amount of fluid to lubricate the testicle so it can move freely without friction. Your body constantly produces and reabsorbs this fluid in perfect balance.

       [ NORMAL TESTICLE ]                     [ HYDROCELE ]
       
          /=============\                         /=============\
         |   Testicle    |                       |   Testicle    |
         |  (Normal size)|                       |  (Compressed) |
          \=============/\                        \=============/\
           \           /                           \  FLUID     /
            \_________/                             \ ACCUMULATING
                                                     \_________/

A hydrocele forms when this fluid balance breaks down—either because the lining produces too much fluid or the surrounding channels fail to drain it properly.

Common Causes in Adults:

Primary (Idiopathic) Hydrocele: Occurs spontaneously with no clear underlying cause, most commonly in men over 40. The lining simply gradually loses its ability to reabsorb fluid effectively.
Secondary Hydrocele: Triggered by an underlying issue in the scrotum, such as:
- A minor injury or trauma to the testicles.
- An infection or inflammation of the testicle or epididymis (epididymo-orchitis).
- Previous hernia repair or varicocele surgery.

Prof. Keskin's Clinical Note: A hydrocele itself does not cause testicular cancer, nor does it affect your fertility or erectile function. However, because testicular tumors can occasionally trigger a secondary fluid reaction, every new scrotal swelling must be evaluated by a doctor and confirmed via a painless ultrasound scan.

"Do all hydroceles need to be treated?"

The short answer is no. If your hydrocele is small, painless, and not bothering you physically, it is completely safe to leave it alone. We call this "watchful waiting."

Hydroceles do not harm the underlying testicle, so treatment is entirely driven by your comfort and quality of life.

When should you consider treatment?

You should discuss fixing the hydrocele with your urologist if:

The swelling has grown large enough to cause a heavy, dragging sensation in your groin.
It causes uncomfortable friction or chafing against your thighs when walking or exercising.
It makes wearing normal clothing or underwear awkward.
You feel self-conscious about its appearance.

"What are my treatment options? Surgery vs. Needle Drainage"

If you decide to treat your hydrocele, there are two main approaches.

1. Hydrocelectomy (Surgical Repair) — The Gold Standard

Hydrocelectomy is a quick, routine day-surgery procedure performed under general or spinal anesthesia.

How it works: A small incision is made in the scrotum. The surgeon drains the trapped fluid and then everts or folds back the sac lining (using techniques such as the Lord’s or Jaboulay’s procedure) and secures it with dissolvable stitches. This eliminates the empty space, preventing fluid from accumulating ever again.
Success Rate: Exceeds 95%, with an extremely low chance of recurrence.

2. Aspiration & Sclerotherapy (Needle Drainage) — The Alternative

For patients who cannot undergo surgery due to severe medical conditions or high anesthetic risk, needle aspiration can be considered.

How it works: A small needle is inserted through the skin under local anesthetic to draw out the fluid. Because leaving the empty sac behind leads to rapid fluid refilling (a 30–50% recurrence rate with simple aspiration alone), a chemical agent like polidocanol or doxycycline (a sclerosing agent) is injected to scar the sac closed.
Success Rate: Roughly 70–80% after one or two treatments, but carries a higher risk of fluid coming back compared to formal surgery.

Comparing Your Options: Ups and Downs

Aspect	Watchful Waiting	Hydrocelectomy (Surgery)	Aspiration + Sclerotherapy
Invasiveness	None.	Minor day-surgery (30–45 mins).	In-clinic needle procedure.
Anesthesia	None.	General or Spinal anesthesia.	Local anesthesia.
Recurrence Risk	High (remains unchanged).	Extremely Low (<5%).	Moderate (~15–30%).
Recovery Time	Immediate.	1–2 weeks light duties; 4 weeks full.	24–48 hours.
Best Suited For	Small, painless hydroceles.	Healthy men seeking a permanent fix.	Elderly/frail men unfit for surgery.

"What should I expect during surgical recovery?"

Hydrocelectomy is an outpatient procedure, meaning you go home the very same day. However, scrotal tissue is naturally soft and prone to swelling, so properly managing your recovery is crucial:

The 3 Rules of Post-Op Care:

Wear Firm Scrotal Support: This is the single most important rule. You must wear a supportive jockstrap or tight-fitting briefs 24/7 for the first 2 weeks post-surgery. Good support prevents gravity from pulling on the wound and dramatically reduces post-operative swelling and bruising.
Ice and Rest: Apply an ice pack wrapped in a towel to the scrotum for 15 minutes at a time during the first 48 hours to minimize swelling. Plan to take 5 to 7 days off work to rest.
Avoid Heavy Lifting: Refrain from heavy lifting (>5 kg), vigorous exercise, or swimming for at least 3 to 4 weeks to allow internal tissues to heal.

"What are the risks or complications?"

Hydrocelectomy is a very safe operation, but like any surgical procedure, minor complications can occur:

Scrotal Swelling & Bruising: Expect the scrotum to look bruised and remain enlarged for 2 to 4 weeks after surgery. It takes time for the tissues to settle down.
Scrotal Hematoma: A collection of blood under the skin inside the scrotum. Small ones reabsorb naturally; larger ones may occasionally need medical drainage.
Infection: Rare, but managed easily with a short course of oral antibiotics.

Final Thoughts from Prof. Keskin

A hydrocele is a very common, benign condition that should never cause you shame or unnecessary worry. If your scrotal swelling is making daily movement uncomfortable, affecting your exercise, or simply bothering you, a straightforward minor surgical procedure can permanently resolve the issue and restore your comfort.

If you notice any new lump or swelling in your scrotum, schedule an appointment with your GP or urologist for a quick physical exam and ultrasound to get clarity and peace of mind.