Why Does Testicular Pain Occur?

Testicular pain is one of the most common symptoms that leads men to consult a urologist, and also one of the most underestimated. Many patients wait days or even weeks before seeking care, hoping the discomfort will go away on its own. However, pain in the testicles is rarely trivial: it can be the first sign of conditions that, without timely treatment, affect fertility, hormonal function, or even represent a medical emergency.

The testicles are highly sensitive organs with a complex vascular and nervous network. This means that pain can originate in the testicle itself, in the epididymis, in the spermatic cord, or even come from other structures such as the groin or lower back. Identifying the source of the pain is the first step toward an accurate diagnosis.

7 Causes of Testicular Pain You Should Know

1. Varicocele

Varicocele is the most common cause of chronic testicular pain in young and reproductive-age men. It is caused by abnormal dilation of the veins of the spermatic cord, similar to varicose veins in the legs. The pain is usually described as a dull, heavy, or throbbing ache that worsens after prolonged standing or at the end of the day, and improves when lying down.

Beyond pain, varicocele is the most common treatable cause of male infertility. If you notice discomfort in the left testicle, where it most frequently occurs, do not dismiss it. The article Varicocele: 5 Warning Signs You Should Not Ignore provides detailed information on how to recognize it early.

2. Epididymitis

Epididymitis is inflammation of the epididymis, the structure that runs along the back of the testicle and transports sperm. It is one of the most frequent causes of acute testicular pain in men between 18 and 35. It typically presents as pain that increases gradually, accompanied by swelling, local warmth, and in some cases urethral discharge or burning during urination. The most common causes are sexually transmitted infections such as chlamydia and gonorrhea, though intestinal bacteria can also be responsible in older men.

3. Orchitis

Orchitis is inflammation of the testicle and can occur alongside epididymitis (epididymo-orchitis). The best-known cause is the mumps virus, though bacterial origin is also possible. Pain is usually intense, with visible swelling and fever. In adult men who were not vaccinated against mumps, viral orchitis can lead to testicular atrophy and impaired sperm production.

4. Testicular Torsion

Testicular torsion is a medical emergency. It occurs when the testicle rotates on the spermatic cord, cutting off blood flow. The pain is sudden and severe, and may be accompanied by nausea, vomiting, and scrotal swelling. Without surgical intervention within the first 4 to 6 hours, the testicle can suffer irreversible damage. It is most common in adolescents and young adults, though it can occur at any age. If you experience sudden, intense testicular pain, go to an emergency room immediately.

5. Inguinal Hernia

An inguinal hernia can cause pain or pressure that radiates toward the scrotum, especially when herniated tissue descends through the inguinal canal. Patients often mistake this for a testicular problem. If you also notice a groin bulge that appears with exertion, the connection is very likely. The article Inguinal Hernia in Men: Causes, Symptoms and Treatment explains in detail how to identify this condition and when surgical intervention is required.

6. Hydrocele and Spermatocele

A hydrocele is an accumulation of fluid around the testicle that creates a feeling of heaviness or pressure rather than sharp pain. A spermatocele is a benign cyst that forms in the epididymis. Both conditions are usually painless, but in some cases produce chronic discomfort. While generally not dangerous, they should be evaluated to rule out more serious causes.

7. Referred Testicular Pain

Not all pain felt in the testicles originates there. Referred pain comes from other structures, such as the kidneys (renal colic), lower back, or abdominal nerves, and manifests in the scrotum without any direct testicular injury. This type of pain can mislead both patient and physician if a thorough evaluation is not performed.

Warning: if testicular pain is sudden, very intense, or accompanied by nausea and vomiting, seek medical attention immediately. Testicular torsion cannot wait.

Can Testicular Pain Mean a Tumor?

A frequent question in the consultation room is whether testicular pain can indicate a tumor. The answer is that testicular cancer, unlike most of the causes described in this article, rarely causes pain in its early stages. It most commonly manifests as a hard, painless lump or a feeling of heaviness in the testicle, noticed by the patient during self-examination or by chance. Pain typically appears in more advanced stages or when secondary inflammation develops.

This does not mean that pain rules out a tumor, but rather that it is not its primary symptom. For this reason, any irregularity in the size, shape, or consistency of the testicle, with or without pain, should be evaluated with a testicular ultrasound. Early detection of testicular cancer carries very high cure rates. A complete guide on testicular tumors — warning signs, diagnosis, and treatment — will be available soon on the Endolapv blog.

When Does Testicular Pain Affect Fertility?

Some causes of testicular pain have a direct impact on male fertility. Varicocele, in particular, raises scrotal temperature and impairs sperm production and quality. When left untreated, it can worsen over time and progressively compromise reproductive function. Viral orchitis and recurrent bacterial epididymitis can also leave lasting damage to the seminal ducts.

If you are planning to have children or have been trying without success, testicular pain, even mild and occasional, should be evaluated with a semen analysis and a complete urological examination. Detecting and treating the cause in time can make a significant difference.

Diagnosis: How Is Testicular Pain Evaluated?

A urological evaluation for testicular pain includes:

• Detailed physical examination of the scrotum, epididymis, and spermatic cord
• Testicular ultrasound with Doppler, to assess blood flow and detect masses, inflammation, or varicocele
• Urinalysis and culture to rule out infection
• Blood tests when infection or hormonal imbalance is suspected
• In selected cases, semen analysis to assess fertility

Ultrasound is the most useful diagnostic tool because it allows real-time visualization of testicular structure, detection of venous dilation characteristic of varicocele, and ruling out masses that could indicate more serious pathology.

When to See a Urologist for Testicular Pain

Consult a specialist if:

• The pain persists for more than a week without an apparent cause
• You notice swelling, firmness, or a change in size in one or both testicles
• Pain appears after an injury and does not improve within a few hours
• You have fever, burning during urination, or discharge along with the pain
• The discomfort is chronic, even if mild, and worsens at the end of the day or after prolonged standing
• You notice a hard lump or irregularity in the testicle, with or without pain
• You are trying to conceive and have recurring testicular pain

At Endolapv, Dr. Salvador Bricio performs a comprehensive urological evaluation to identify the source of testicular pain and provide the most appropriate treatment for each case. The consultation in Puerto Vallarta is available to both local patients and those traveling from the United States or Canada seeking specialized medical care.

Conclusion

Testicular pain should never be ignored or delayed. Behind what seems like a minor discomfort, there may be a treatable condition that, when detected early, protects reproductive health and overall wellbeing. From varicocele to testicular torsion, each cause has a specific treatment and a different prognosis depending on when it is addressed. If you have any concerns, the first step is always a consultation with a specialist.