Testicular Lump or Swelling:
Causes, Symptoms and When to See a Urologist
Finding a lump in the testicle or noticing testicular swelling can be worrying. Although most testicular lumps are not caused by cancer, every new lump should be assessed. Conditions such as hydroceles, varicoceles, epididymal cysts and infections are common causes of testicular lumps or scrotal swelling. Because it is difficult to determine the cause based on symptoms alone, a consultation with a urologist and a scrotal ultrasound are often recommended.
Early assessment provides reassurance for many men and allows prompt treatment if a more serious condition, such as testicular cancer or testicular torsion, is identified.
Overview
Discovering a lump, swelling or change in one of your testicles can be worrying. While many men immediately think about testicular cancer, most testicular lumps are not cancerous. A variety of conditions affecting the testicle or surrounding structures can produce similar symptoms, and it is often impossible to determine the cause without a physical examination and imaging.
Most men are referred to a urologist because they have noticed a lump, swelling or change in one testicle. In many cases, the cause turns out to be a benign condition rather than cancer.
Some lumps arise from the testicle itself, while others develop in nearby structures such as the epididymis or veins surrounding the testicle. The appropriate treatment depends entirely on the underlying diagnosis. Some conditions require only reassurance or observation, while others benefit from medication or surgery.
Because symptoms frequently overlap, any new testicular lump, swelling or persistent change should be assessed promptly rather than monitored at home.
What Can Cause a Testicular Lump or Swelling?
Many different conditions can cause a lump or swelling in the scrotum. Some are harmless, while others require prompt medical attention.
| Possible cause | How it commonly presents |
|---|---|
| Testicular cancer | Usually a firm, painless lump or hard area within the testicle. Some men notice the testicle becoming larger or heavier. |
| Hydrocele | Painless swelling around the testicle caused by fluid. The scrotum often feels enlarged rather than containing a distinct lump. |
| Varicocele | Enlarged veins that may feel like a “bag of worms”, most commonly on the left side. May be associated with a dull ache or heaviness. |
| Epididymal cyst (Spermatocele) | A smooth, rounded lump beside or above the testicle, rather than arising from the testicle itself. Usually painless. |
| Epididymitis | Painful swelling of the epididymis, often with tenderness, redness or urinary symptoms. |
| Testicular torsion | Sudden, severe testicular pain and swelling. This is a medical emergency requiring immediate treatment. |
| Inguinal hernia | A bulge extending into the scrotum that may become more noticeable when standing, coughing or straining. |
| Scrotal skin cyst | A small lump arising from the scrotal skin, rather than from the testicle itself. Often benign and movable beneath the skin. |
Many of these conditions can cause similar symptoms, and it is often not possible to determine the cause based on symptoms alone. A physical examination and a scrotal ultrasound are commonly recommended to establish the diagnosis and determine whether any treatment is needed.
Common Symptoms
Symptoms vary depending on the underlying condition. You may notice:
- A lump in one testicle
- Swelling of one or both testicles
- A hard area within the testicle
- A feeling of heaviness in the scrotum
- A dull ache in the groin or lower abdomen
- A “bag of worms” sensation above the testicle
- A lump beside the testicle rather than within it
- Pain or tenderness in the scrotum
- Redness or warmth of the scrotal skin (more common with infection)
- One testicle feels different from the other
- A painless lump in the testicle
Some men experience only subtle changes, while others notice obvious swelling or discomfort.
Is Every Testicular Lump Cancer?
No.
Most testicular lumps are not caused by cancer. Conditions such as hydroceles, varicoceles, epididymal cysts and infections are much more common.
However, testicular cancer often presents as a painless lump, making it impossible to distinguish cancer from other conditions based on symptoms alone.
For this reason, any persistent or unexplained testicular lump should be assessed promptly.
When Should You See a Urologist?
Arrange an assessment if you notice:
- A new lump in either testicle
- Swelling that does not improve
- One testicle becoming noticeably larger
- A testicle that feels harder than usual
- Persistent heaviness in the scrotum
- Any new lump that persists or continues to enlarge over several days
- Ongoing discomfort lasting more than a few days
Do not wait for symptoms to become painful before seeking medical advice.
When Is It An Emergency?
Some symptoms require immediate medical attention.
Seek emergency care immediately if you develop:
- Sudden, severe testicular pain
- Rapid swelling
- Nausea or vomiting together with severe scrotal pain
- A testicle sitting higher than normal
These symptoms may indicate testicular torsion, where the blood supply to the testicle becomes twisted. Early treatment offers the best chance of preserving the testicle.
What Happens During Your Consultation?
Your assessment usually begins with a discussion of:
- When you first noticed the lump
- Whether it is painful
- Any recent injury
- Fever or urinary symptoms
- Previous scrotal surgery
- Family history of testicular cancer
- History of undescended testicle
Based on the findings, a scrotal ultrasound can often be arranged to confirm the diagnosis.
What Tests May Be Needed?
Most men require only a small number of investigations.
These may include:
Scrotal ultrasound
This is the most important investigation for a new testicular lump. Ultrasound helps determine whether the lump is within the testicle or arises from surrounding structures. Ultrasound is painless, does not use radiation and usually takes about 15–30 minutes.
Blood tests
If cancer is suspected, blood tests called tumour markers may be recommended.
CT scan
A CT scan is generally reserved for patients in whom testicular cancer has already been diagnosed or is strongly suspected.
Treatment Depends on the Cause
Treatment is directed at the underlying diagnosis rather than the symptom itself.
| Diagnosis | Possible treatment |
|---|---|
| Hydrocele | Observation or hydrocele surgery |
| Varicocele | Observation or microsurgical varicocelectomy |
| Epididymal cyst | Usually reassurance; surgery if symptomatic |
| Epididymitis | Antibiotics where appropriate |
| Testicular torsion | Emergency surgery |
| Testicular cancer | Radical orchidectomy, with additional treatment if required |
Most causes of a testicular lump are benign and treatable. Even when treatment is required, many conditions can be managed successfully. If testicular cancer is diagnosed, outcomes are generally excellent when detected early.
Frequently Asked Questions
Is every testicular lump cancer?
No. Most testicular lumps are caused by benign conditions such as hydroceles, varicoceles or epididymal cysts. However, a new lump should always be assessed because testicular cancer cannot be excluded based on symptoms alone.
Can a painless lump be cancer?
Yes. Testicular cancer often presents as a painless lump or firm area within the testicle.
What if the lump is beside the testicle?
A lump beside the testicle is commonly caused by an epididymal cyst or spermatocele rather than testicular cancer. An ultrasound can usually distinguish between these conditions.
What does a scrotal ultrasound show?
A scrotal ultrasound helps determine whether a lump arises from the testicle itself or from surrounding structures. It is the first-line imaging investigation for most men with a new testicular lump.
Which doctor should I see?
A urologist is the specialist who diagnoses and treats conditions affecting the urinary tract and male reproductive organs, including testicular lumps and swelling.
Can a testicular lump disappear on its own?
Some causes, such as mild inflammation, may improve over time. However, any persistent lump or swelling should be assessed to determine the underlying cause.
Can a hydrocele feel like a testicular lump?
Yes. A hydrocele is a collection of fluid around the testicle that often causes painless swelling. Because it can sometimes resemble other conditions, a physical examination and scrotal ultrasound may be recommended.
Can a varicocele cause a lump?
Yes. A varicocele is caused by enlarged veins within the scrotum and is often described as feeling like a “bag of worms”. It is a common cause of scrotal swelling, particularly on the left side.
Concerned About a Testicular Lump or Swelling?
Finding a new lump or swelling can be worrying, but most testicular lumps are not caused by cancer. The next step is to identify the underlying cause through a careful examination and, where appropriate, a scrotal ultrasound.
Dr Roger Anthony Idi, Consultant Urologist at Prince Court Medical Centre, provides assessment and management for a range of conditions affecting the testicles and scrotum, including testicular lumps, hydroceles, varicoceles, epididymal cysts, infections and testicular cancer.
If you have noticed a new lump in the testicle or scrotal swelling, arrange a consultation for an assessment and discussion of the appropriate next steps.