The short answer
Some cancer treatments can affect the ability to have children later. For young adults who may want children, options to preserve fertility — such as freezing eggs, embryos, or sperm — usually work best when arranged before treatment begins. Raising this early with your team is important, even when time is short.
Some treatments can affect future fertility; effects vary by treatment.
Fertility preservation usually works best before treatment starts.
Options include freezing sperm, eggs, or embryos.
Ask about fertility as early as possible, even if time is tight.
Choose how you want to understand this
The full explanation.
Why fertility can be affected
Some cancer treatments can reduce or end the ability to have children. These include certain chemotherapy drugs, radiation to the pelvis, and some surgeries or hormone therapies. Whether it happens, and how much, depends on the treatment, the doses, and your own body. Not everyone's fertility is affected. Still, it is worth knowing where you stand.
Why timing matters
The strongest options for protecting fertility are usually done before treatment starts. That is why it helps to raise the topic as early as you can after diagnosis. Do it even if it feels like a lot, and even if time is short. Acting early keeps more choices open.
Common options
For men, freezing sperm is simple and quick. It is often called sperm banking. For women, the options include freezing eggs or embryos, and those take some planning. Other approaches exist in some cases. A fertility specialist, called a reproductive endocrinologist, can explain which options fit your cancer and your treatment timeline.
Starting the conversation
Tell your cancer team you want to talk about fertility. Ask for a referral to a fertility specialist if that makes sense. If having children may matter to you later, it is worth asking even when you are unsure. Cost and logistics can often be worked through, with help from specialists and support groups.
When to get help sooner
Fertility is a planning question, not an emergency. But the timing is urgent. Once treatment starts, some options close.
- Call 911 or go to an emergency department if after an egg collection you become short of breath, cannot lie flat, faint, or one leg swells and turns hot and painful. Those point to a severe reaction to the fertility drugs or to a clot, and neither waits.
- Call your care team the same day if you have pain, bleeding, or a fever after a fertility procedure. CDC gives 100.4°F (38°C) as the temperature to act on for people in cancer treatment: if chemotherapy has already started, CDC calls a fever a medical emergency and says to call your doctor immediately rather than waiting. Ring the same day too if your treatment start date moves up, or if treatment begins within a week or two and no one has referred you to a fertility specialist yet.
- Call your care team within a day or two if cost or scheduling problems might push back your cancer treatment, or if you change your mind about a fertility step.
Never delay cancer treatment on your own to make room for fertility care. Your team can weigh the two together and tell you what is safe.
Sources
Words to know
Tap any term to see what it means.
Common questions
Do all cancer treatments affect fertility?
No. It depends on the specific treatment, doses, and your body. Some treatments affect fertility, others do not, so ask about your situation.
When should I think about fertility?
As early as possible after diagnosis. Fertility preservation usually works best before treatment begins.
What are the options?
Freezing sperm for men, and freezing eggs or embryos for women, among others. A fertility specialist can explain what fits you.
What if I'm not sure I want children?
It is still worth asking early, because preserving the option is easier before treatment. You can decide later.
Questions to ask your doctor
Being prepared helps you get the most out of your appointments. Save or print these questions.
Tap a question to save it to your list (kept on this device).
Speak With Trained Specialists & Human Navigators
Cancer Explained provides educational guidance, but does not replace trained specialists, social workers, or your medical team.
Talk to a trained cancer information specialist
Free, confidential assistance from NCI Cancer Information Service via phone, chat, or email.
Contact your oncology team
Locate after-hours contact numbers, portal messages, or urgent triage phone lines.
Find a patient navigator
Get one-on-one help with appointments, logistics, translation, and care coordination.
Find a genetic counselor
Discuss inherited mutation risk, family history, and genetic testing options.
Find an oncology social worker
Access emotional counseling, family support groups, and mental health resources.
Find a financial navigator
Locate copay assistance foundations, grant programs, and lodging/travel support.
Find a clinical-trial specialist
Search matching studies and speak with NCI trial information specialists.
Get urgent help
Immediate emergency guidance for fever (>100.4°F during chemo), severe pain, or shortness of breath.
Help Us Improve This Guide
Did this explanation answer your question and help you determine your next step?
Know someone who needs this?
Plenty of people are looking for something like this and do not know where to start. If this would help a friend or someone you love, send it on — we have written an opening line so you do not have to stare at an empty message. You can change every word of it.
Your message is written and sent in your own email or messaging app — we never see who you send it to, and nothing is added to any list.
Knowledge Check
0 of 3 answered
This self-assessment checks understanding of educational content only. It is not medical advice.
Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Sources last checked: 2026-08-13 what this meansLast updated: 2026-08-18Next planned review: 2028-07-12
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 — Editorial review complete. This page completed Cancer Explained's editorial checks (sources, safety, plain language, duplication). It has not been reviewed by a physician or other healthcare professional.
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: Editorial review complete — This page completed Cancer Explained's editorial checks (sources, safety, plain language, duplication). It has not been reviewed by a physician or other healthcare professional.
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.
Read more about our editorial process, our use of AI, and our corrections policy.
Spotted a problem? Report an error — a factual mistake, broken or outdated source, confusing wording, or anything that seems unsafe. Please do not include names, medical record numbers, dates of birth, addresses, or other identifying medical information in your report.
After using this page, do you understand what to do next?
Anonymous — we only record the answer, never who gave it.
Related articles
Still have questions?
Educational answers, plain language
Free to print and share