The most common early sign is a lump or swelling in one testicle

Most men with testicular cancer first notice a lump, swelling, or hardness in one testicle. The lump is usually painless, though not always. It may feel like a pea or marble embedded in the tissue, or the entire testicle may feel enlarged and firm. Some men describe it as a heaviness or fullness in the scrotum, or notice that one side looks or feels different from the other.

The lump is often small enough that you would only feel it during self-examination or by accident. It does not necessarily hurt, which is why many men do not notice it right away. If you find any lump, thickening, or area that feels different from the surrounding tissue, that is the signal to see a doctor—not to wait and see if it goes away.

Testicular cancer grows in the cells that make sperm, and these tumors tend to develop in men between 15 and 40 years old, though they can occur at any age. Catching the lump early, before it spreads, makes a major difference in treatment options and outcomes.

Key Takeaways

  • A painless lump, swelling, or hardness in one testicle is the most common early sign and warrants a doctor's visit.
  • Other early symptoms include a feeling of heaviness in the scrotum, a change in testicle size or texture, or fluid buildup around the testicle.
  • Pain in the testicle or lower abdomen can occur but is less common as an initial symptom than a lump.
  • Later symptoms—such as back pain, shortness of breath, or a lump in the neck or abdomen—suggest the cancer may have spread beyond the testicle.
  • Any change in how a testicle looks or feels should be checked by a doctor, even if it seems minor or painless.

Heaviness, swelling, or a change in how the testicle feels

Beyond a distinct lump, you might notice the affected testicle feels heavier than usual, or that the scrotum on that side feels fuller or more swollen. Some men report a dull ache or sense of pressure rather than sharp pain. The testicle may also feel firmer or have a different texture than it did before, or you might see visible swelling in the scrotum.

Fluid can sometimes build up around the testicle (a condition called a hydrocele), which creates swelling but is usually painless. While a hydrocele is often not cancer, any new swelling or change in how the testicle feels should be evaluated by a doctor to rule out other causes, including cancer.

Pain or discomfort in the testicle or lower abdomen

Some men experience pain or a dull ache in the affected testicle, though this is less common as an initial symptom than a lump. The pain may be constant or come and go. A few men report pain or discomfort in the lower abdomen or groin area, sometimes on the side where the cancer is growing.

It is important to know that testicular cancer does not always hurt. Many men have no pain at all in the early stages. Pain in the testicle can have many causes—injury, infection, or other benign conditions—so pain alone does not mean cancer. But any testicle pain that lasts more than a few days, especially if it is paired with a lump or swelling, should be checked by a doctor.

Symptoms that suggest the cancer may have spread

If testicular cancer spreads beyond the testicle, you may develop symptoms in other parts of the body. These include back pain (from enlarged lymph nodes in the abdomen), shortness of breath or chest pain (if cancer reaches the lungs), or a lump in the neck or abdomen. Some men notice fatigue, loss of appetite, or weight loss.

These later symptoms do not mean the cancer is untreatable—many men with advanced testicular cancer still recover well with the right treatment. But they do mean the cancer has had time to grow, so getting evaluated as soon as you notice any early sign (like a lump) is important.

Why some men do not notice symptoms early

Testicular cancer can grow without causing obvious pain or discomfort, which is why regular self-examination matters. A lump may be small and easy to miss, especially if you are not used to how your testicles normally feel. Some men are embarrassed to mention a lump to a doctor, or they assume it will go away on its own.

The testicles are not a part of the body most men examine regularly, so a new lump or change in texture may go unnoticed for weeks or months. By the time symptoms become obvious—such as pain or visible swelling—the cancer may have grown larger. Knowing what to feel for and checking yourself once a month can catch changes much earlier.

What to do if you notice a lump or change

If you find a lump, swelling, hardness, or any change in how a testicle looks or feels, schedule an appointment with your primary care doctor or a urologist. Bring it up directly: "I found a lump in my testicle" or "One testicle feels different from the other." Do not wait to see if it goes away.

Your doctor will examine both testicles and may order an ultrasound of the scrotum, which is painless and takes about 10 minutes. An ultrasound can show whether a lump is solid (more concerning) or fluid-filled (usually benign), and it can help rule out other causes of swelling. If cancer is suspected, further tests will follow, but the ultrasound is the first step.

Many lumps and changes in the testicle are not cancer—they may be cysts, scar tissue, or benign growths. But the only way to know is to have it checked. Finding a lump is not a diagnosis; it is a reason to get one.

Frequently Asked Questions

Does testicular cancer always cause pain?

No. Most men with early testicular cancer feel a lump or notice swelling but have no pain at all. Pain can occur but is less common as an initial symptom. Any lump, swelling, or change in how the testicle feels—with or without pain—should be checked by a doctor.

How often should I check my testicles for lumps?

Once a month is a common recommendation. The best time is after a warm bath or shower, when the scrotum is relaxed. Gently roll each testicle between your fingers and thumb, feeling for lumps, hardness, or areas that feel different from the surrounding tissue. You are learning what is normal for you so you can notice changes.

Can a lump in the testicle be something other than cancer?

Yes. Many lumps and changes are benign—cysts, scar tissue, or fluid buildup are common. An ultrasound can usually tell the difference. But because testicular cancer is possible, any new lump or change should be evaluated by a doctor rather than ignored.

What if I feel a lump but it does not hurt?

A painless lump is actually the most common way testicular cancer first shows up. Pain is not required for a lump to be serious. Schedule a doctor's visit to have it examined and imaged. Many painless lumps turn out to be benign, but the only way to know is to check.

Should I be worried if one testicle is slightly larger than the other?

Some size difference between testicles is normal. But if you notice a new change—one testicle suddenly becoming noticeably larger, firmer, or swollen—that is worth mentioning to a doctor. A sudden change is more concerning than a difference that has always been there.