The short answer
Cancer treatment changes sex physically through hormones, nerves and tissue. This covers dryness, stenosis, dilators, erectile changes, desire, and which referrals to request.
Vaginal moisturizers and lubricants are different products used at different times, and both may be needed.
Pelvic radiation can cause vaginal stenosis; NCI lists dilators as a way to help prevent or reverse scarring.
Vaginal estrogen helps dryness, but in hormone-receptor-positive cancer whether it is appropriate is a decision for your oncologist.
Erectile difficulty can often be treated. NCI mentions medicines and penile implants; a urology or sexual medicine referral can explain the rest.
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This page is for anyone whose sex life has changed because of cancer treatment. It covers dryness and pain, erection changes, low desire, and what help to ask for.
What Treatment Does to the Body
Sex can change after cancer treatment. The reasons include hormones, nerves and tissue. It is not a failure of desire, and you do not have to wait it out quietly. Chemotherapy, pelvic radiation, hormone therapy and surgery can all affect sexual function. NCI says opioids and some antidepressants may also lower interest in sex.
Most of what follows can be treated, or at least improved. Almost none of it gets raised unless you raise it.
Dryness, Pain and Narrowing
NCI says chemotherapy and pelvic radiation can lower estrogen and cause vaginal dryness. Pelvic radiation can cause vaginal stenosis. That means a shorter, narrower, less elastic vagina. Scarring can make both sex and internal examinations painful.
Here is what can be offered.
- Lubricants and moisturizers. NCI recommends both for comfort. Ask your team which to use, how often, and which products to avoid if you are sore.
- Dilators. NCI says a dilator can help prevent or reverse scarring after pelvic radiation. Ask when to start, how often, and for how long. Ask what to do if it hurts.
- Vaginal estrogen may be appropriate for some types of cancer (NCI). If your cancer is hormone-sensitive, your oncologist decides whether it suits you. Do not start hormonal products without asking, including ones you can buy over the counter.
- Pelvic muscle exercises. NCI mentions exercises for the pelvic muscles to lower pain. Ask about pelvic floor physical therapy.
- Menopause symptoms. Treatment that lowers estrogen can bring on menopause symptoms such as hot flashes and dryness. Ask what options exist for you.
Erections, Ejaculation and Testosterone
Erectile difficulty after prostate or pelvic surgery can come from nerve damage. NCI says surgery may affect the nerves, and radiation can affect sexual function if blood vessels or nerves are damaged. Hormone therapy and chemotherapy can lower testosterone.
Medicines for erection problems exist, and a urology or sexual medicine clinic can explain which suit you. NCI also mentions penile implants, a firm rod or inflatable device, for men who need them. Testosterone may be checked if desire has gone flat. It is not appropriate in every cancer.
Dry orgasm (orgasm without ejaculation) can happen when the prostate is damaged. Ask your team what to expect. NCI advises using a condom during chemotherapy, because semen may contain traces of the drugs.
Desire, Fatigue and Everything Else
Fatigue can make sex harder. Practical changes can help. Plan for the part of the day when you have energy. Time your pain medicine so it is actually working. Choose positions that do not put weight on a painful area. Treat touch without sex as a real option, not a consolation prize. Neuropathy (nerve damage from treatment) changes what touch feels like. Ports, lines, stomas and scars change what you want seen, and when.
What to Ask For at Your Appointment
Say it plainly at your next appointment. "Sex is painful." "I cannot get an erection." "I have no desire at all." Then ask for one of these: a sexual health or sexual medicine clinic, gynecology or urology, pelvic floor physical therapy, or a certified sex therapist. Fertility questions go to a fertility specialist. Ask before treatment starts if you can, but ask even if treatment has finished.
Clinicians often do not raise this. Partly it is time, and partly it is awkwardness. So the question usually has to come from you. It is a completely ordinary thing to bring to a follow-up.
When to Get Help Sooner
- Call 911 or go to an emergency department if an erection is painful or lasts longer than 4 hours. MedlinePlus lists this as a reason to call your doctor immediately when taking sildenafil, and the same urgency is sensible for any erection treatment. Trapped blood damages tissue, so this is a same-hour problem, not an embarrassing one to sit out. Do not drive yourself.
- Call 911 or go to an emergency department if chest pain starts during sex, or you feel faint or sick with it. MedlinePlus says to call a doctor immediately and avoid sexual activity until you are told otherwise. Chest pain is treated as a possible heart problem until someone rules that out. Tell the emergency team what you have taken and when. Do not drive yourself.
- Call your care team right away, at any hour, if a line site becomes sore, red or inflamed (CDC).
- Call your care team within a day or two if intercourse or a dilator hurts every time, if there is bleeding afterwards, or if a scar or stoma becomes sore or inflamed. Pain that keeps recurring is a referral question, usually to pelvic floor physical therapy or a sexual medicine clinic.
Sources

Common questions
What is the difference between a vaginal moisturizer and a lubricant?
NCI recommends vaginal lubricants or moisturizers for comfort. In general, a lubricant is used at the time of sex, and a moisturizer is used on a regular schedule. Ask your team which to use and how often.
Why have I been given dilators, and do I have to use them?
Pelvic radiation can cause vaginal stenosis — a shorter, narrower, less elastic vagina — and scarring that makes both sex and internal examinations painful. NCI lists a dilator as a way to help prevent or reverse scarring. Ask when to start, how often, for how long, and what to do if it hurts.
Can I use vaginal estrogen if I had breast cancer?
That depends on your cancer and your current treatment, and it is a decision to make with your oncologist rather than at the pharmacy. NCI says vaginal estrogen cream may be appropriate for some types of cancer, not all. If your cancer is hormone-sensitive, the risks and alternatives need weighing with your oncologist. Do not start hormonal products, including over-the-counter ones, without asking.
What are the options for erection problems after cancer treatment?
Medicines for erection problems exist, and NCI also mentions penile implants, a firm rod or inflatable device placed in the penis. NCI notes that chemotherapy and hormone therapy can lower testosterone. Ask for a referral to urology or a sexual medicine clinic to learn which options suit your cancer.
I have no desire at all. Is that psychological?
It is often physical. NCI says chemotherapy and hormone therapy can lower hormone levels, and that opioids and some antidepressants may lower interest in sex. Fatigue can also play a part. Ask your team to look at these contributors first.
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Written by: Cancer ExplainedSources last checked: 2026-07-30 what this meansLast updated: 2026-10-02Next planned review: 2027-01-30
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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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