Hydrocele: A Comprehensive Medical Guide

Overview

A hydrocele is a fluid‑filled sac surrounding the testicle that causes swelling of the scrotum. The condition is usually painless and benign, but its appearance can be distressing and, in rare cases, it may indicate an underlying problem.

Who it affects: Hydroceles are most common in newborn boys (congenital hydrocele) and in adult men over age 40. They can also occur in infants with certain developmental abnormalities.

Prevalence: In the United States, hydroceles affect about 1 % of men at some point in their lives; the incidence rises to 5 % in men older than 50 years. Congenital hydroceles are seen in roughly 1 in 100 newborn males.^{[1] Mayo Clinic}

Symptoms

While many hydroceles cause no discomfort, they can produce a number of noticeable signs. Common symptoms include:

• Scrotal swelling: A smooth, painless enlargement that may be as small as a grape or as large as a tennis ball.
• Feeling of heaviness: Some men describe a sensation of extra weight in the groin.
• Transilluminating glow: When a flashlight is shone through the scrotum, the fluid often glows, indicating a fluid‑filled cavity.
• Pain or discomfort: Typically mild; can increase with prolonged standing or physical activity.
• Irregular shape of the testicle: The testicle may feel separate from the swelling.
• Redness, warmth, or fever: These signs suggest infection (e.g., epididymitis) rather than a simple hydrocele and need urgent evaluation.

Causes and Risk Factors

Primary causes

• Congenital hydrocele: Persists when the processus vaginalis—a peritoneal extension that normally closes after birth—fails to seal, allowing fluid to accumulate.
• Acquired hydrocele: Usually results from inflammation or injury that increases fluid production or impairs drainage. Common triggers include:
  • Infection (e.g., epididymitis, orchitis)
  • Trauma to the scrotum
  • Testicular tumor (fluid may collect as a reaction)
  • Inguinal hernia

Risk factors

• Age > 40 years (acquired hydroceles become more common)
• History of scrotal surgery or trauma
• Chronic infections of the reproductive tract
• Underlying medical conditions such as liver cirrhosis or congestive heart failure that cause fluid overload (rare)

Diagnosis

Diagnosing a hydrocele is usually straightforward and involves a combination of history, physical examination, and occasionally imaging.

Physical examination

• Inspection for swelling and asymmetry.
• Palpation to assess consistency; hydroceles feel fluid‑filled and separate from the testicle.
• Transillumination: A light source placed against the scrotal skin produces a reddish‑blue glow if fluid is present.

Imaging and tests

• Scrotal ultrasound: The gold‑standard imaging tool. It confirms the presence of fluid, evaluates testicular size and blood flow, and rules out masses or hernias.^{[2] Cleveland Clinic}
• Blood tests: May be ordered if infection or tumor is suspected (CBC, tumor markers such as AFP, β‑hCG, LDH).
• Urinalysis: Helps identify urinary tract infections that could be linked to epididymitis.

Treatment Options

Most hydroceles do not require immediate treatment unless they cause discomfort, grow rapidly, or are linked to another condition.

Watchful waiting

• Infants: Many congenital hydroceles resolve spontaneously by 12–18 months; regular follow‑up is recommended.
• Adults: Small, painless hydroceles can be observed with periodic examinations.

Medications

• There is no specific drug that eliminates hydrocele fluid. However, antibiotics are prescribed if a bacterial infection (e.g., epididymitis) is present.

Surgical procedures

• Hydrocelectomy (open repair): A small incision in the scrotum or lower abdomen allows the surgeon to drain the fluid, remove the sac, and close the opening. This is the most common definitive treatment.^{[3] NIH}
• Microsurgical or minimally invasive (laparoscopic) hydrocelectomy: Offers faster recovery and less postoperative pain for selected patients.
• Sclerotherapy: Injection of a sclerosing agent (e.g., phenol) into the sac to cause scarring and collapse. Used mainly when surgery is contraindicated.

Lifestyle & supportive measures

• Supportive underwear or a scrotal support garment to reduce discomfort.
• Ice packs (15 minutes at a time) for swelling after activity.
• Analgesics such as acetaminophen or ibuprofen for mild pain.

Living with Hydrocele

Even after treatment, men may need to adapt certain habits to maintain comfort and protect scrotal health.

• Clothing: Choose loose‑fitting, breathable underwear (e.g., boxer briefs) to avoid pressure.
• Exercise: Low‑impact activities (walking, swimming) are safe. Avoid heavy lifting or intense contact sports until healing is complete (typically 4–6 weeks post‑surgery).
• Self‑examination: Perform monthly testicular checks. Note any new lumps, changes in size, or pain and report them promptly.
• Hydration & diet: No direct impact, but maintaining overall fluid balance is important if you have heart or kidney disease.
• Follow‑up appointments: Attend scheduled postoperative visits to ensure the sac has not recurred.

Prevention

Because many hydroceles are congenital, they cannot be prevented. However, steps can reduce the risk of acquired hydroceles:

• Practice safe sex and use condoms to lower the risk of sexually transmitted infections that can cause epididymitis.
• Promptly treat any urinary or genital infections.
• Wear protective equipment during sports or work that involve risk of scrotal trauma.
• Maintain a healthy weight to lessen pressure on the groin area.
• Manage chronic conditions (e.g., heart failure, liver disease) that may lead to fluid accumulation.

Complications

Although hydroceles are benign, untreated or complicated cases can lead to:

• Scrotal discomfort or pain: Large hydroceles can become heavy and interfere with daily activities.
• Infection (hydrocele cellulitis): Bacterial invasion of the fluid sac.
• Testicular atrophy: Sustained pressure may impair blood flow to the testicle over time.
• Hernia formation: An associated inguinal hernia may develop or become difficult to differentiate.
• Recurrence: Up to 10 % of surgically treated hydroceles may recur, especially if the underlying processus vaginalis remains open.

When to Seek Emergency Care

References

1. Mayo Clinic. “Hydrocele.” https://www.mayoclinic.org. Accessed May 2026.
2. Cleveland Clinic. “Hydrocele – Diagnosis and Treatment.” https://my.clevelandclinic.org. Accessed May 2026.
3. National Institutes of Health (NIH). “Hydrocele.” MedlinePlus. https://medlineplus.gov. Updated 2024.
4. Centers for Disease Control and Prevention (CDC). “Testicular Torsion.” https://www.cdc.gov. Accessed May 2026.