The short answer
The most common sign of testicular cancer is a painless lump or swelling in a testicle. Other signs include a feeling of heaviness or a dull ache. Other conditions can cause lumps, but any new one should be checked, and survival is high overall.
A painless lump or swelling in a testicle is the most common sign.
A feeling of heaviness or a dull ache in the scrotum or lower belly can occur.
Testicular symptoms can have causes other than cancer, but any new one should be checked.
Testicular cancer is most often diagnosed in men aged 20 to 34.
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The simple version
This page covers the signs of testicular cancer and what happens if you find a change. The most common sign is a painless lump or swelling in a testicle. Symptoms can have other causes, but any new one should be checked. Survival is high overall.
Signs to know
Possible signs include:
- A painless lump or swelling in a testicle, the most common sign
- A change in the size, shape, or firmness of a testicle
- A feeling of heaviness in the scrotum
- A dull ache in the lower belly or groin
- Sudden fluid buildup in the scrotum
- Pain or discomfort in a testicle, though pain is less common than a painless lump
A painless lump can be easy to dismiss.
A new, painless lump in a testicle should always be checked.
Sudden, severe pain in a testicle is different. It can be testicular torsion, when the testicle twists and loses its blood supply. Call 911 or the local emergency number, or be seen right away, because the testicle can be damaged when its blood supply is cut off. Do not wait to see if it settles. Our page on testicular lumps, swelling, and pain has more.
Why a lump usually is not cancer, but still needs checking
The National Cancer Institute says these symptoms may be caused by testicular cancer or by other conditions. A lump can also be the first sign of testicular cancer, so every new lump deserves a prompt exam by a doctor.
Who it affects
SEER reports that testicular cancer is most often diagnosed among men aged 20 to 34, with a median age at diagnosis of 33. It makes up about 0.5 percent of new cancer cases in the United States.
Highly treatable, even when advanced
SEER reports a 5-year relative survival of about 95 percent for testicular cancer overall. A prompt check still matters, because earlier diagnosis gives your team more options.
Body awareness, not formal self-exams
Knowing what feels normal for you helps a real change stand out. What matters is noticing a new lump or change, in the shower or in daily life, and getting it checked.
What tests come next
If a lump is found, your doctor will examine you and may order tests, such as imaging and blood tests for tumor markers (AFP, beta-hCG, and LDH). If cancer is suspected, the next step is usually surgery to remove the entire testicle. The National Cancer Institute describes this surgery as inguinal orchiectomy.
What to ask your team
- Does my lump or change need imaging tests?
- What do my tumor marker results show?
- What are the next steps if cancer is confirmed?
- What are my options for preserving fertility before any treatment begins?
Sources
Common questions
What is the most common sign?
A painless lump or swelling in a testicle is the most common sign. Some men notice a change in size or firmness rather than a distinct lump.
What other symptoms occur?
Other signs include a feeling of heaviness in the scrotum, a dull ache in the lower belly or groin, or discomfort in a testicle.
Who gets testicular cancer?
SEER reports it is most often diagnosed among men aged 20 to 34, with a median age at diagnosis of 33.
Is it treatable?
SEER reports a 5-year relative survival of about 95 percent overall, which is why checking a new lump promptly matters.
Questions to ask your doctor
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Last updated: 2026-10-16Next planned review: 2027-07-07
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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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