What Is a Hydrocele?
A hydrocele is a medical condition characterized by the buildup of fluid within the thin membranes (tunica vaginalis) that surround one or both testicles, resulting in swelling of the scrotum. It commonly presents as a painless, smooth, and sometimes large bulge in the scrotal area. Hydroceles can occur in males of any age but are most often seen in newborns and older men.
In infants, hydroceles are typically congenital—related to incomplete closure of the abdominal processes during development—and generally resolve on their own. In adults, hydroceles are usually acquired, often due to inflammation, injury, or, rarely, underlying infections or tumors. While hydroceles are rarely harmful, persistent swelling or discomfort means that further evaluation is needed.
Key Point: Hydroceles are the most common cause of painless scrotal swelling in males and are frequently harmless, though adult cases should always be evaluated by a healthcare professional.
Key Takeaways
- Hydroceles are fluid collections around the testicle, leading to scrotal swelling.
- They are most often painless, though very large hydroceles can cause discomfort or a feeling of heaviness.
- Infants and older men are most commonly affected.
- Most hydroceles in infants resolve spontaneously within the first year or two of life.
- In adults, hydroceles are often linked to trauma, infection, or underlying medical conditions.
- Surgical treatment may be needed for large, persistent, or symptomatic hydroceles, especially in adults.
- Hydroceles can sometimes indicate underlying health issues like infection, hernia, or–rarely–a tumor.
- Diagnosis is typically made via physical examination and ultrasound.
- Communicating hydroceles are connected to the abdominal cavity and may fluctuate in size; non-communicating hydroceles do not.
- Any rapid onset of pain, redness, or fever with a scrotal lump warrants urgent medical evaluation.
Table of Contents
- What Is a Hydrocele?
- Quick Facts Table: Hydroceles
- What Are the Types of Hydrocele?
- What Causes a Hydrocele?
- What Are the Symptoms of Hydrocele?
- How Is a Hydrocele Diagnosed?
- What Are the Treatment Options for Hydrocele?
- What Complications Can Hydroceles Cause?
- Can a Hydrocele Affect Fertility or Sexual Function?
- How Can Scrotal Swelling Be Prevented or Minimized?
- When Should You See a Doctor About a Hydrocele?
- Frequently Asked Questions About Hydrocele
- References and Further Reading
- Disclaimer
Quick Facts Table: Hydroceles
| Aspect | Details |
|---|---|
| Definition | Fluid accumulation in the sac surrounding the testicle (tunica vaginalis) |
| Common Ages | Newborns, infants, boys, men >40 years |
| Types | Communicating, Non-communicating |
| Symptoms | Scrotal swelling, heaviness, mild discomfort |
| Treatment Options | Observation (children), Surgery (adults), Aspiration or sclerotherapy (rare; adults) |
| Prognosis | Excellent, often resolves spontaneously in infants; surgical treatment is very effective |
| Risks | Infection, hernia, rarely underlying tumors if persistent in adults |
| Contagious | No |
What Are the Types of Hydrocele?
Hydroceles are classified based on how the fluid accumulates and whether there is an open connection between the abdominal cavity and the scrotum.
Communicating Hydrocele
A communicating hydrocele occurs when a small channel or connection (patent processus vaginalis) remains between the abdominal cavity and the sac around the testicle after birth. This allows abdominal fluid to pass into the scrotum, leading to swelling that often fluctuates in size throughout the day. Communicating hydroceles are typical in newborns and young children and may be associated with an inguinal hernia.
Non-Communicating Hydrocele
A non-communicating hydrocele develops when the pathway between the abdomen and the scrotum has closed, but fluid has become trapped around the testicle or continues to accumulate due to an imbalance between fluid production and absorption. Swelling with this type does not change much over time or with position.
Other Descriptive Classifications
- Primary hydrocele: Occurs without obvious underlying cause; more common in older men.
- Secondary hydrocele: Develops as a result of infection (such as epididymitis or orchitis), trauma, tumors, or surgery.
Did you know? Hydroceles may affect one side (unilateral) or both sides (bilateral) of the scrotum.
What Causes a Hydrocele?
The causes of hydrocele depend on age and underlying health factors.
Causes of Hydrocele in Infants
The most common form in infants is congenital hydrocele, which results from a failure of the processus vaginalis to close after the testicles descend into the scrotum during fetal development. When this channel stays open, fluid from the abdomen can collect in the scrotal sac.
Other factors can include:
- Premature birth (increased risk of patent processus vaginalis)
- Family history of hydrocele or hernia
Causes of Hydrocele in Adults
In adults, hydroceles are generally acquired and can be caused by:
- Injury or trauma to the scrotum or groin
- Infection or inflammation (orchitis or epididymitis), sometimes related to sexually transmitted infections or urinary tract infections (source)
- Previous surgery in the groin, such as hernia repair
- Testicular tumors or cysts (rare, but hydroceles may obscure or result from these)
- Aging and weakening of tissues, which can lead to impairment in fluid absorption
Additional Risk Factors
- Being a newborn: Especially in premature infants
- Age over 40: Tissue changes and increased risk of secondary hydroceles
- History of groin surgery: Particularly hernia repairs
- Living in areas where lymphatic filariasis is present: This parasitic infection is a significant global cause of hydrocele, though it’s rare in developed countries (WHO)
What Are the Symptoms of Hydrocele?
Common Hydrocele Symptoms
- Scrotal swelling: The primary symptom, which may develop gradually or suddenly. It can be either one-sided or affect both sides.
- Heaviness or fullness: A sensation of weight or bloating in the scrotum.
- Mild discomfort or aching: Usually only if swelling becomes large.
- Transillumination: The scrotum may glow when a flashlight is shone through it, indicating the presence of clear fluid.
Key Point: Hydroceles are typically painless. New, sudden, or severe pain, fever, or red/discolored scrotal skin needs urgent medical attention.
Symptoms That Require Prompt Medical Attention
- Sudden, severe pain in the scrotum: Could indicate testicular torsion (surgical emergency)
- Redness, warmth, or tenderness of the scrotum: Suggests infection or inflammation
- Fever or chills: Signs of systemic infection
- Hard lumps or masses in the scrotum: May indicate a tumor
- Nausea or vomiting with scrotal swelling: Possible testicular torsion
Hydrocele Symptoms Table
| Symptom | Common in Hydrocele? | Red Flag for Other Cause? |
|---|---|---|
| Painless swelling | Yes | No |
| Scrotal heaviness | Yes | No |
| Severe pain | Rare | Yes (seek urgent care) |
| Redness/warmth | Sometimes | Yes (possible infection) |
| Fever | No | Yes (possible infection) |
| Lump/hard mass | No | Yes (possible tumor) |
How Is a Hydrocele Diagnosed?
Most hydroceles can be diagnosed in a primary care or urology office using a simple combination of history, physical examination, and sometimes imaging.
Steps in Diagnosis
- History and Physical Exam: A doctor will ask about the onset, duration, and progression of swelling, history of trauma, infection, and then carefully examine the scrotum.
- Transillumination: Shining a penlight through the scrotum can help distinguish a hydrocele from a solid mass. Fluid allows light to pass through, while a tumor or hernia does not.
- Scrotal Ultrasound: Often used to confirm the diagnosis and rule out other conditions, such as hernias, tumors, or varicoceles (source).
- Urine and blood tests: To check for signs of infection, if present.
- CT or MRI (rare): Reserved for complex or uncertain cases.
Did you know? Ultrasound is a painless, non-invasive way to confirm a hydrocele and rule out serious scrotal conditions.
What Are the Treatment Options for Hydrocele?
Treatment for hydrocele depends on age, symptom severity, size, and whether an underlying cause is found.
Observation ("Watch and Wait")
- Infants: Most congenital hydroceles resolve spontaneously by 12–24 months, so observation is generally recommended unless the hydrocele is large, growing, or associated with a hernia.
- Adults: Asymptomatic, small hydroceles can be observed. Regular monitoring ensures there are no signs of infection, tumor, or complications.
Surgical Treatment (Hydrocelectomy)
-
Hydrocelectomy: An outpatient surgical procedure to remove or repair the fluid-filled sac. Surgery can be performed via a small incision in the scrotum or groin, under anesthesia.
- Recovery: Most people return to light activities in about a week, with full recovery in several weeks (source).
- Risks: Infection, bleeding, pain, rare recurrence.
Aspiration and Sclerotherapy
- Aspiration: Using a needle to draw out the fluid. Generally reserved for patients who cannot undergo surgery due to age or health problems. Recurrence is common.
- Sclerotherapy: After aspiration, a chemical agent is injected to scar the tissue and prevent fluid from re-accumulating. Sclerotherapy is less effective than surgery and is used less frequently (source).
Treating Underlying Causes
If the hydrocele is secondary to infection, trauma, or a tumor, treatment of the root cause is essential (i.e., antibiotics for infection, referral to a specialist for possible tumor).
Hydrocele Treatment Options Table
| Treatment | Suitable For | Pros | Cons or Caveats |
|---|---|---|---|
| Observation | Infants; asymptomatic adults | Non-invasive, low risk | Not for symptomatic/persistent cases |
| Hydrocelectomy | Symptomatic, persistent hydroceles | Highly effective, definitive cure | Surgical risks, recovery required |
| Aspiration | Non-surgical candidates | Minimally invasive option | High recurrence, infection risk |
| Sclerotherapy | Select, high-risk adults | May delay fluid return | Discomfort, less effective, recurrence |
| Treat underlying | All with secondary cause | Prevents recurrence, addresses root | Primary condition must be managed |
Key Point: Most pediatric hydroceles resolve on their own, but adults with persistent symptoms often require surgery for lasting relief.
What Complications Can Hydroceles Cause?
While most hydroceles are benign, there are potential complications, especially with large or chronic cases:
- Infection of fluid or tissue: Can cause pain, redness, and fever
- Inguinal hernia development (especially with communicating hydroceles): Loop of intestine can enter the scrotum, sometimes causing dangerous bowel obstruction
- Testicular atrophy: Large hydroceles may impair blood flow, leading to shrinkage or damage to the testicle (rare)
- Impaired sperm production: Chronically elevated scrotal temperature from a large hydrocele may reduce sperm quality (source)
- Masking of testicular tumors: Large hydroceles can hide tumors, delaying diagnosis
Risks and Ways to Reduce Them Table
| Potential Complication | How to Reduce Risk |
|---|---|
| Infection | Promptly treat hydroceles and genital infections |
| Hernia | See a doctor for fluctuating or persistent swelling |
| Testicular atrophy | Treat large hydroceles surgically before damage |
| Masking of tumors | All hydroceles should have ultrasound evaluation |
| Infertility | Early intervention for large or complex cases |
Can a Hydrocele Affect Fertility or Sexual Function?
Most hydroceles, particularly small or moderate ones, do not affect fertility or sexual function. However, there are scenarios where large or longstanding hydroceles may contribute to fertility concerns:
- Scrotal temperature elevation: Large hydroceles can increase the temperature surrounding the testicle, which may negatively impact sperm production.
- Physical discomfort: Substantial swelling may cause discomfort during intercourse or physical activity.
- Delayed detection of testicular conditions: A hydrocele may obscure a tumor or other issue, delaying diagnosis and treatment for conditions that could impact fertility.
If you have concerns about fertility or conceiving with a partner, discuss these with your healthcare provider, who may recommend semen analysis and further evaluation.
How Can Scrotal Swelling Be Prevented or Minimized?
While not all hydroceles are preventable, some general measures may help minimize risk and support early detection:
- Practice safe sex: Protects against sexually transmitted infections that may cause hydrocele.
- Wear protective gear: Use athletic cups during sports or high-risk activities to prevent trauma.
- Regular self-exams: Monthly scrotal exams can help you notice swelling, lumps, or changes early.
- Promptly treat urinary or genital infections: Early medical care can prevent secondary hydroceles.
- Maintain good general health: Good hygiene, nutrition, and hydration promote resilience of the genitourinary system.
When Should You See a Doctor About a Hydrocele?
Prompt medical evaluation is important if you experience:
- New, unexplained or sudden onset scrotal swelling
- Swelling in infants lasting beyond 1–2 years
- Pain, redness, or tenderness in the scrotum
- Fever, chills, or feeling generally unwell
- Hard lumps, firmness, or changes in scrotal texture
- Symptoms of testicular torsion: Sudden pain, nausea, vomiting, red or hard scrotum (medical emergency!)
Key Point: Early medical assessment is vital—many scrotal/testicular conditions are highly treatable if caught quickly, and proper diagnosis ensures the best outcomes.
Frequently Asked Questions About Hydrocele
What does hydrocele mean in men's sexual health?
A hydrocele is a collection of fluid around the testicle that causes the scrotum to swell. It is usually painless and does not directly impact sexual performance or libido, though very large hydroceles can cause discomfort and body image concerns for some men.
Is hydrocele normal for men or boys?
Hydroceles are very common in newborn boys, affecting up to 10% of males at birth (source). In adults, hydroceles should be evaluated to rule out underlying causes, but small, stable hydroceles may be harmless.
Is hydrocele dangerous?
Most hydroceles are harmless and benign. However, swelling in adults or rapidly enlarging hydroceles should be checked to rule out infection, tumor, or hernia, which may require urgent treatment.
Can a hydrocele go away on its own?
In infants, hydroceles typically go away without treatment within the first 12–24 months. In adults, spontaneous resolution is rare unless the underlying cause is addressed.
What are the symptoms of hydrocele?
The main symptom is painless swelling or heaviness of the scrotum. Occasionally, mild discomfort may occur, especially with large hydroceles. Any severe pain, redness, or fever is not typical and should be assessed by a doctor.
How is a hydrocele diagnosed?
Diagnosis is based on physical examination, transillumination (using a light to distinguish fluid), and ultrasound, which helps rule out more serious causes of swelling (source).
How is hydrocele treated in adults?
Surgical removal (hydrocelectomy) is the standard treatment for large, symptomatic, or bothersome hydroceles in adults. Aspiration and sclerotherapy are alternatives for those who cannot undergo surgery but are associated with higher recurrence rates.
How is hydrocele treated in infants?
Most infant hydroceles do not require treatment and resolve with time. Surgery is only considered if the hydrocele persists beyond 1–2 years, becomes very large, or is associated with a hernia.
Can hydrocele affect fertility in men?
Small hydroceles seldom affect fertility. However, very large or long-standing hydroceles may increase scrotal temperature and slightly decrease sperm quality, though this is rare (source).
Does hydrocele hurt?
Hydroceles are usually not painful. Mild aching or heaviness is possible with larger hydroceles. Severe or sudden pain, especially in the context of swelling, should be evaluated promptly.
Are there non-surgical treatments for hydrocele?
Aspiration with or without sclerotherapy is an option for men who cannot undergo surgery, but fluid usually reaccumulates and repeated aspirations may be necessary.
Can an adult hydrocele be a sign of testicular cancer?
While hydroceles are usually benign, some testicular tumors can present with a hydrocele, which is why ultrasound is recommended in all new adult cases to rule out malignancy.
How long does recovery take after hydrocele surgery?
Most men return to light activities within 1–2 weeks after hydrocelectomy and recover fully within 3–4 weeks. Heavy lifting and strenuous exertion should be avoided during early healing.
Is aspiration a permanent solution to hydrocele?
No, aspiration alone is temporary, as fluid typically reaccumulates. Sclerotherapy may reduce recurrence, but surgery is more reliable for a lasting cure.
How do I talk to my partner about scrotal swelling or hydrocele?
Stay open and non-judgmental. Explain the condition is typically benign, share your feelings, and invite your partner for emotional support or to attend doctor appointments if they wish.
Can I prevent hydroceles?
Not always, but protecting the scrotum from injury, practicing safe sex, and treating infections quickly can lower risk.
When should I seek emergency care for a swollen scrotum?
Seek immediate medical care for any scrotal swelling with sudden pain, redness, fever, nausea/vomiting, or a hard or discolored testicle—especially in children, as this may signal a surgical emergency like testicular torsion.
Can hydrocele be confused with other causes of swelling?
Yes, hernias, testicular tumors, varicoceles, and hematoceles can resemble hydroceles. Proper evaluation by a healthcare professional is needed for an accurate diagnosis.
Can hydrocele recur after surgery?
Recurrence is uncommon after hydrocelectomy but can happen, particularly if the entire sac isn’t removed or in the presence of persistent underlying factors.
References and Further Reading
- Ku, JH. The management of hydrocele. https://pubmed.ncbi.nlm.nih.gov/18182671/
- Cimador, M et al. Hydrocele in paediatric patients: A review. https://pubmed.ncbi.nlm.nih.gov/18182671/
- Grady, RW et al. Communicating hydroceles and their hydroceles in children: Review. https://pubmed.ncbi.nlm.nih.gov/7063496/
- Mark, SD et al. The effect of hydrocele repair on fertility. https://pubmed.ncbi.nlm.nih.gov/19202773/
- Woodward, PJ et al. From the archives of the AFIP: Extratesticular scrotal masses. https://pubmed.ncbi.nlm.nih.gov/15719969/
- Cobellis, G et al. Sclerotherapy as treatment for hydrocele. https://pubmed.ncbi.nlm.nih.gov/3561490/
- Wang, HHS. Surgical management of hydrocele. https://pubmed.ncbi.nlm.nih.gov/26430493/
- American Urological Association. Hydrocele and Varicocele. https://www.auanet.org/
- National Institute of Diabetes and Digestive and Kidney Diseases. Hydrocele. https://www.niddk.nih.gov/
- World Health Organization. Lymphatic filariasis. https://www.who.int/news-room/fact-sheets/detail/lymphatic-filariasis
Disclaimer
This article is for informational and educational purposes only and does not constitute medical or mental health advice. It is not a substitute for speaking with a qualified healthcare provider, licensed therapist, or other professional who can consider your individual situation.
Hydroceles are a common cause of painless scrotal swelling in men and boys. Recognizing the symptoms, knowing when to seek evaluation, and understanding treatment options are essential for safeguarding reproductive health and overall wellbeing. Most hydroceles are benign, but timely medical assessment ensures that serious conditions are not overlooked.
