Testicular pain has a wide range of causes, from a minor bump that resolves on its own to a surgical emergency that needs attention within hours. The most important thing is figuring out which category your pain falls into. Sudden, severe pain that comes on without warning is the most urgent scenario and should be treated as an emergency until proven otherwise.
When It’s an Emergency
Testicular torsion happens when the spermatic cord twists and cuts off blood flow to the testicle. It causes sudden, intense pain, often with nausea, vomiting, and swelling. The testicle may sit higher than usual or at an odd angle. This is a true time-sensitive emergency: within the first 6 hours, the survival rate for the testicle is about 97%. Between 7 and 12 hours, it drops to 79%. After 24 hours, only about 18% of testicles can be saved. If you’re experiencing sudden severe pain, especially if it woke you up or hit you out of nowhere, go to the emergency room immediately.
Torsion is most common in teenagers and young men, but it can happen at any age. Surgery to untwist the cord and anchor the testicle is the standard fix, and the procedure is straightforward when caught early.
Infection and Inflammation
Epididymitis, an infection of the coiled tube behind the testicle, is one of the most common causes of testicular pain in adults. It typically builds gradually over a few days rather than hitting all at once. You’ll usually notice pain on one side, swelling, warmth, and sometimes a fever or burning during urination. In sexually active men under 35, sexually transmitted bacteria are the usual culprits. In older men, the infection more often comes from urinary tract bacteria, sometimes related to prostate issues or difficulty emptying the bladder completely.
Orchitis, inflammation of the testicle itself, can develop alongside epididymitis or on its own. Viral orchitis sometimes follows a mumps infection. Both conditions are treatable with antibiotics (for bacterial causes) or supportive care (for viral ones), and most people recover fully within a few weeks. In the meantime, over-the-counter pain relievers, ice packs wrapped in a towel, and supportive underwear help manage discomfort.
Pain From Somewhere Else
Sometimes the testicle hurts, but the actual problem is elsewhere. This is called referred pain. Kidney stones are a classic example: as a stone moves through the urinary tract, it can send sharp or aching pain down into the groin and testicle. The pain often comes in waves and may be accompanied by blood in the urine, nausea, or back pain on one side.
A herniated disc or pinched nerve in the lower back can also trigger testicular pain. An inguinal hernia, where tissue pushes through a weak spot in the abdominal wall near the groin, is another common source. If the pain gets worse when you cough, strain, or lift heavy objects, a hernia is worth considering. With referred pain, the testicle itself looks and feels normal on examination.
Varicoceles
A varicocele is a cluster of enlarged veins inside the scrotum, similar to varicose veins in the leg. They’re extremely common, affecting roughly 15% of men, and most cause no symptoms at all. When they do cause discomfort, it’s usually a dull, heavy ache that worsens as the day goes on or after physical activity. Larger varicoceles sometimes feel like a soft lump above the testicle, often described as feeling like a bag of worms. They’re almost always on the left side.
Most varicoceles don’t need treatment. If yours is painful enough to interfere with your day or if fertility is a concern, a minor procedure can redirect blood flow away from the enlarged veins.
Trauma
A direct hit to the testicle causes immediate, intense pain that usually fades within an hour. If the pain doesn’t ease, or if you notice significant swelling, bruising, or nausea that persists, it’s worth getting checked. In rare cases, blunt trauma can rupture the outer lining of the testicle. An ultrasound can detect this: any abnormal internal pattern on imaging after an injury raises concern and typically leads to surgical repair. Early repair has much better outcomes than waiting.
Testicular Cancer
Cancer is not a common cause of testicular pain, but it’s worth knowing what to look for. The classic sign is a painless, hard lump on the testicle. However, 30 to 40 percent of testicular cancer cases do involve a dull ache or sense of heaviness. The pain is rarely sharp or sudden. Testicular cancer is most common in men between 15 and 35 and has excellent survival rates when caught early. If you feel a firm lump or notice one testicle has changed in size or texture, get an ultrasound.
Chronic Testicular Pain
If your pain has been lingering for three months or longer and is affecting your daily life, it fits the definition of chronic scrotal pain. Sometimes the cause is identifiable: a low-grade infection, a small varicocele, nerve damage from a prior surgery like a vasectomy, or scar tissue. But in many cases, no clear cause is found even after thorough testing. This is called idiopathic chronic scrotal pain, and it’s more common than most people realize.
Treatment for chronic cases usually starts conservatively with anti-inflammatory medications, nerve-calming medications, pelvic floor physical therapy, or nerve blocks. The approach is often trial and error, and finding the right combination takes patience. Surgery is considered a last resort.
How Doctors Figure Out the Cause
A physical exam alone can narrow down the possibilities significantly. Your doctor will check for swelling, lumps, tenderness, and the position of the testicle. A urine test can identify signs of infection.
If there’s any doubt, a scrotal ultrasound with Doppler imaging is the go-to test. It can check blood flow (to rule out torsion), identify masses, detect fluid collections, and visualize varicoceles. For torsion specifically, ultrasound has a sensitivity of about 86%, which is good but not perfect. If torsion is strongly suspected based on symptoms and the physical exam, doctors may go straight to surgery rather than wait for imaging, because the clock is ticking.
What the Type of Pain Tells You
- Sudden, severe pain that peaks within minutes: torsion until proven otherwise. Go to the ER.
- Gradually worsening pain over days with swelling or fever: likely infection (epididymitis or orchitis).
- Dull, heavy ache that worsens with standing or activity: varicocele or referred pain.
- Pain after a direct hit that doesn’t fade within an hour: possible rupture, worth an ER visit.
- Heaviness with a firm lump you haven’t noticed before: get an ultrasound to rule out cancer.
- Pain that comes in waves with back or flank pain: consider kidney stones.