The short answer
Cancer treatment can affect a man's sexual health — for example, lowering sex drive or making erections harder to get or keep. Many changes are temporary and improve after treatment, while others last longer. There are treatments, devices, and support that can help, and a care team can explain the options.
Cancer treatment can lower sex drive or make erections harder to get or keep.
Chemotherapy can lower testosterone and libido but does not usually affect erections.
Radiation to the pelvis, hormone therapy, and some surgeries can cause erectile dysfunction.
Some pain and depression medicines can lower sex drive.
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The full explanation.
The simple version
Men being treated for cancer may notice changes that affect their sexual life. These can happen during treatment and sometimes after. According to the National Cancer Institute (NCI), you may not have the same energy or interest in sex that you had before. Even so, feeling close to a partner often stays important. Many changes are temporary and improve once treatment ends. Others may last, or may start after treatment.
Whether you have problems depends on several things. They include the type of cancer and treatment, the dose and length of treatment, your age, the time since treatment, and other health factors.
How treatments can affect sexual health
NCI describes several ways treatment can affect a man's sexual health.
- Chemotherapy may lower testosterone and libido during treatment. A condom may be advised, because semen can carry traces of chemotherapy for a time. Chemotherapy does not usually affect the ability to have an erection.
- Radiation therapy to the pelvis can affect sexual function. Damage to blood vessels or nerves can make it hard to get or keep an erection. If the prostate is affected, you may have a dry orgasm.
- Hormone therapy can lower testosterone and sex drive. It can also make erections harder to get or keep.
- Surgery for penile, rectal, prostate, testicular, and other pelvic cancers may affect the nerves involved in erections. Nerve-sparing surgery can sometimes prevent these problems.
- Medicines used for pain and depression can lower sex drive. So can drugs that affect the nerves and blood vessels.
Other health problems can also contribute, such as heart disease, high blood pressure, diabetes, and smoking.
Ways to manage sexual health issues
Most men can be sexually active during treatment, but NCI advises confirming this with your doctor. At times when the risk of infection or bleeding is higher, you may be advised to abstain. Condom use may also be advised.
Your care team can help you:
- Learn about treatments. Once a problem is diagnosed, an oncologist or urologist can advise on options. These include medicines that increase blood flow to the penis and, in some cases, a penile implant.
- Learn about condoms and contraception. These may be advised to protect a partner from chemotherapy in semen, or to prevent pregnancy.
- Manage related side effects. Pain, fatigue, hair loss, low mood, or trouble sleeping can all affect your sex life. Speaking up helps you get support.
- Get support and counseling. Sharing concerns with people you are close to can help. So can a professionally led support group. A nurse or social worker can recommend groups and counselors.
Your care team is the best guide to what your treatment may mean and what can help.
When to get help sooner
- Call your doctor immediately if an erection is painful, or lasts longer than 4 hours, after a medicine for erection problems. MedlinePlus gives the same instruction for sudden severe loss of vision, or sudden loss of hearing, after a dose. If you cannot reach anyone, go to an emergency department rather than waiting.
- Call your care team the same day if your urine turns red or pink, you see blood in your semen, or you cannot pass urine at all.
- Call your care team within a day or two if it starts to burn when you pass urine, or a rash or sore appears on the penis or nearby skin. Both can point to infection.
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Common questions
Does chemotherapy cause erectile dysfunction?
Chemotherapy can lower testosterone and libido during treatment, but NCI notes it does not usually affect the ability to have an erection. Erectile dysfunction is more often linked with radiation to the pelvis, hormone therapy, or some surgeries.
Why might a condom be advised?
Semen may contain traces of chemotherapy for a period of time after treatment, so a condom may be advised to protect a partner. Depending on a partner's age, contraception may also be advised to prevent pregnancy.
What can help with erectile problems?
Once a problem is diagnosed, an oncologist or urologist can advise on options. These may include medicines that increase blood flow to the penis and, in some cases, a penile implant. Nerve-sparing surgery can sometimes prevent problems.
Can I be sexually active during treatment?
Most men can be sexually active during treatment, but you should confirm this with your doctor. At times when the risk of infection or bleeding is higher, you may be advised to abstain, and condom use may be advised.
Who can help me cope?
Your doctor, nurse, or social worker can help, and you may also talk with a sexual health expert or urologist. Professionally led support groups and counseling can help you and your partner cope.
Questions to ask your doctor
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Sources last checked: 2026-08-13 what this meansLast updated: 2026-08-17Next planned review: 2027-01-14
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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. 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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