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.
NCI does not have evidence-based information about preventing testicular cancer.
Choose how you want to understand this
The full explanation.
The simple version
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 can occur at other ages. It is most common in men in their twenties and early thirties. Because it is uncommon overall, many people know little about it. That is part of why clear, calm information matters.
Prevention and screening
NCI is direct on prevention. It does not have evidence-based information about preventing testicular cancer. There is no proven step that prevents it, so we will not suggest one.
NCI does publish patient information about testicular cancer screening. No routine screening test is advised for everyone, the way mammograms are for breast cancer. 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.
- Call your care team the same day 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
Words to know
Tap any term to see what it means.
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?
NCI states that it does not have evidence-based information about preventing testicular cancer. In other words, there is no proven way to prevent it. If you have concerns, your healthcare team can help you understand your situation.
Is there screening for testicular cancer?
NCI has patient information about testicular cancer screening. There is no routine screening test recommended for everyone the way there is for some other cancers. Being aware of changes and checking in with a healthcare professional about anything new is a sensible approach.
Questions to ask your doctor
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Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Sources last checked: 2026-07-21 what this meansLast updated: 2026-08-11Next planned review: 2027-07-21
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. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
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General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team 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.
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. We do not employ clinicians and do not intend to — our work 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 checked line by line against the sources listed on it. That confirms the sources support what the page says. 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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