The short answer
Testicular cancer most often begins in the germ cells that make sperm. It is rare and is most often diagnosed in men ages 20 to 34. Importantly, most testicular cancers can be cured — even when found at an advanced stage.
Testicular cancer most often begins in germ cells, the cells that make sperm.
It is rare and is most frequently diagnosed in men ages 20 to 34.
Most testicular cancers can be cured, even if diagnosed at an advanced stage.
The American Cancer Society says most cases can't be prevented at this time.
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The whole article, with every detail and caution.
The simple version
This page gives a plain overview of testicular cancer: who it affects, the signs to know, and next steps.
Testicular cancer most often begins in germ cells, the cells that make sperm. It is rare overall. It also stands out for one reason: it is most often diagnosed in younger men, between the ages of 20 and 34.
There is an encouraging headline here. According to the National Cancer Institute, most testicular cancers can be cured, even if diagnosed at an advanced stage. That is worth holding onto if you are facing this diagnosis.
Who it affects
Testicular cancer is most common in men in their twenties and early thirties, but it can occur at other ages. Because it is uncommon overall, many people know little about it. That is part of why clear, calm information matters.
Prevention and screening
The American Cancer Society says it is not possible to prevent most cases at this time. Many men who get it have no known risk factors. So we will not suggest a prevention step.
NCI says there is no standard or routine screening test for testicular cancer. Most often, men find it themselves, by chance or during a self-exam. A calm, low-key approach works better. Notice changes, and mention anything new to a healthcare professional. They can decide whether further checks make sense.
Signs worth mentioning
NCI lists these changes as reasons to check with a doctor:
- A painless lump or swelling in either testicle.
- A change in how a testicle feels.
- A dull ache in the lower belly or the groin.
- A sudden build-up of fluid in the scrotum.
- Pain or discomfort in a testicle or in the scrotum.
Other conditions can cause the same signs. That is why they need a look rather than a guess.
Turning information into next steps
If you or someone you love is facing this diagnosis, the most useful next step is a talk with a care team. They can explain the type, the tests used to diagnose and stage it, and the treatment choices. They can also cover effects on fertility. This page is educational only. It is not a substitute for that advice.
When to get help sooner
- Call 911 or go to an emergency department if you have sudden, severe pain in a testicle or the scrotum, especially with nausea or vomiting. MedlinePlus says to go to an emergency room, not urgent care, because surgery may be needed right away. Do not drive yourself.
- Call your care team right away if a testicle becomes red, hot, or swollen quickly, or the scrotum fills with fluid over a day or two.
- Call your care team within a day or two if you find a new painless lump, swelling, or firm area in a testicle, or a dull ache in the groin or lower belly that does not settle.
Sources
Common questions
What is testicular cancer?
Testicular cancer most often begins in germ cells — the cells that make sperm. According to the National Cancer Institute, it is a relatively rare cancer, and most cases can be cured.
Who is most likely to get testicular cancer?
Testicular cancer is most frequently diagnosed in men ages 20 to 34, which makes it one of the more common cancers in younger men, even though it is rare overall. A healthcare professional is the best source of information about individual risk.
Can testicular cancer be cured?
Most testicular cancers can be cured, even if they are diagnosed at an advanced stage. Outcomes depend on the specific situation, and your healthcare team is the best source of information about what a diagnosis means for you.
Can testicular cancer be prevented?
The American Cancer Society says it is not possible to prevent most cases at this time. Many men who get it have no known risk factors. If you have concerns, your healthcare team can help you understand your situation.
Is there screening for testicular cancer?
NCI says there is no standard or routine screening test for testicular cancer. Being aware of changes and checking in with a healthcare professional about anything new is a sensible approach.
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Sources last checked: 2026-07-21 what this meansLast updated: 2026-09-29Next planned review: 2027-07-21
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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