Medical Oncologist
CION Cancer Clinics
Will colon cancer treatment affect my chance of having children? | CION Cancer Clinics
Colon cancer treatment can affect fertility, but it does not always. The operation itself rarely touches the womb, ovaries or testes. Chemotherapy is the main concern, because it can lower sperm counts and stop periods, sometimes for good. If you might want children, raise it before treatment starts, because sperm banking and egg freezing have to happen first. This page explains what each treatment does and what to ask. At CION Cancer Clinics, our team supports patients and families with diet, bowel changes and life during and after treatment.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- Does colon cancer treatment affect fertility?
- Which parts of colon cancer treatment affect fertility?
- What can you do to protect fertility before treatment?
- What families often believe about fertility after colon cancer
- What this page cannot tell you
- Common questions about fertility and colon cancer treatment
The short answer
Does colon cancer treatment affect fertility?
It can, but often less than people fear. The operation for colon cancer is on the bowel, not on the womb, ovaries or testes, so on its own it rarely ends fertility. Chemotherapy is the part most likely to affect it. It can lower a man's sperm count, and it can make a woman's periods stop, sometimes for a few months and sometimes for good.
Why it has to be raised early
Anything that protects fertility, such as storing sperm or freezing eggs, has to happen before chemotherapy starts. Once the first dose is given, those options become harder and less reliable. Many young people are never asked about this, and many feel too shy to bring it up. If children might matter to you, say so at the first consultation, even if you are not married yet.
What decides your own risk
For women, age matters most, because the ovaries hold a fixed supply of eggs that falls with time. A woman in her late thirties is more likely to have her periods stop for good than a woman in her twenties. For men, the drugs used and the sperm count before treatment matter more. Your oncologist can tell you where you sit.
Periods stopping during chemotherapy does not mean you cannot get pregnant. Contraception is still needed.Treatment by treatment
Which parts of colon cancer treatment affect fertility?
Each treatment acts differently. Most people have surgery, and some have chemotherapy afterwards.
Surgery
A colectomy removes part of the bowel and leaves the reproductive organs in place. In women, scar tissue inside the abdomen can sometimes affect the tubes that carry eggs, which may make getting pregnant slower. Rarely, a tumour stuck to an ovary means that ovary is removed as well.
Chemotherapy
The usual combinations after colon surgery, called FOLFOX and CAPOX, are not among the drugs most strongly linked to infertility. The evidence is thin, though. Sperm counts often fall during treatment and may recover over the following months or years. Periods may stop and return, or may not return in women nearer menopause.
Targeted therapy and immunotherapy
These are used mainly when the cancer has spread. Bevacizumab carries a warning that it can stop the ovaries working, and this may not recover. For immunotherapy, the effect on fertility is largely unknown. Ask before starting either.
Radiation
Radiation is rarely used for colon cancer. It is common in rectal cancer, where the pelvis is treated and the ovaries and testes lie close by. If pelvic radiation has been mentioned, you may be on the rectal cancer pathway instead.
Not sure whether this applies to you?
Ask an oncologistBefore the first dose
What can you do to protect fertility before treatment?
Say it at the first visit
Tell your oncologist you may want children. Bring your partner or a parent if that makes it easier. Once the team knows, it can often plan the timing of chemotherapy around it.
For men: store sperm
Sperm banking means giving samples at a fertility clinic, where they are frozen and stored. It takes only a few visits and rarely delays treatment. It is worth doing even if you are unmarried.
For women: freeze eggs or embryos
Hormone injections stimulate the ovaries for about two weeks, then eggs are collected and frozen. Unmarried women can freeze eggs. Chemotherapy usually starts some weeks after surgery, so recovery time can sometimes be used for this.
Ask about protecting the ovaries
Some women are offered monthly injections that rest the ovaries during chemotherapy. The evidence comes mostly from breast cancer, and it does not replace egg freezing. Our page on fertility preservation explains each option in detail.
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If a pregnancy happens during treatment
Chemotherapy and targeted drugs can harm a developing baby. Use reliable contraception throughout treatment, and for as long afterwards as your oncologist advises. This applies to men whose partners could conceive too. If a pregnancy test is positive, tell your oncologist the same day, before the next dose is given.
Commonly believed
What families often believe about fertility after colon cancer
"Chemotherapy always makes you infertile."
Many people treated for colon cancer go on to have children. The risk depends on age, the drugs and how long they are given. It is a risk to plan around, not a certainty.
"My children will get cancer because I had it."
Most colon cancer is not inherited. A small number of families carry a gene fault such as Lynch syndrome, which a child can inherit. Young patients are usually tested for this, and a genetic counsellor can explain what a result means for future children.
"A woman with a stoma cannot carry a pregnancy."
Women with a stoma have carried pregnancies safely. The stoma changes size and shape as the abdomen grows, so the stoma nurse and the obstetrician need to know early.
"Asking about fertility will delay my cancer treatment."
Sperm banking rarely delays anything. Egg freezing can often fit into the gap between surgery and chemotherapy. If waiting is not safe in your case, your oncologist will tell you honestly.
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What this page cannot tell you
It cannot tell you your own chance of having children after treatment. That depends on your age, your egg or sperm supply before treatment, the exact drugs and how long you receive them. A fertility specialist can test your starting point, and your oncologist can tell you which drugs are planned.
Who this does not apply to
If you are past menopause, or your family is complete and you are sure of it, most of this page will not matter to you. If you are pregnant now and have just been diagnosed, your care needs its own plan between an oncologist and an obstetrician, so call the helpline rather than relying on this page. Rectal cancer treated with pelvic radiation carries different and usually greater risks.
Where CION fits
Your CION medical oncologist plans chemotherapy and can time it around fertility steps where that is safe. Sperm banking and egg freezing are done at a fertility clinic, and your oncologist can refer you there.
Questions we are asked
Common questions about fertility and colon cancer treatment
Can I have a baby after colon cancer treatment?
Many people do, either naturally or with help from a fertility clinic. Your chances depend on your age, the treatment you had and whether sperm or eggs were stored first. A fertility specialist can test how much reserve you have once treatment is over and advise you from there.
How long should I wait before trying for a baby?
There is no single rule. Doctors usually advise waiting for a while after the last dose, so the drugs have cleared and the early follow-up scans are done. How long depends on your stage, the drugs you had and your follow-up plan. Agree the timing with your oncologist before stopping contraception.
Will my periods come back after chemotherapy?
For many younger women they do, though it can take several months. Women closer to menopause are less likely to see them return. Periods returning is a good sign but does not prove fertility is unchanged, so a fertility specialist may check your egg reserve with a blood test and a scan.
Is sperm banking worth it if I am not married yet?
Yes, if you think you may want children one day. It is simple, quick and rarely delays treatment. Stored sperm keeps for a long time, and you can decide later whether to use it. Many young men regret not being asked, so raise it yourself if nobody else does.
Can my wife get pregnant while I am on chemotherapy?
It is not advised. Chemotherapy can damage sperm, and small amounts of some drugs can pass into semen. Use condoms throughout treatment and for as long afterwards as your oncologist suggests. If your wife does become pregnant, tell your oncologist so the team can advise you both.
Will my child inherit colon cancer from me?
Usually not. Most colon cancer is not inherited. Young patients are often checked for Lynch syndrome and similar conditions, because a child can inherit those. If a fault is found, a genetic counsellor can explain your options before you plan a pregnancy.
Does having a stoma stop me having children?
No. A stoma does not affect the ovaries, womb or sperm. Women with a stoma have had safe pregnancies, with the stoma nurse adjusting the bag as the abdomen grows. Sex and intimacy with a stoma raise their own questions, which your stoma nurse can talk through with you.
Who should I talk to about fertility at CION?
Start with your medical oncologist, ideally before surgery or as soon as chemotherapy is mentioned. They can explain the risk from your planned drugs and refer you to a fertility clinic. If you are unsure how to raise it, call the helpline and someone will help you prepare.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- National Cancer Institute — Chemotherapy to Treat Cancer
- American Cancer Society — Colorectal Cancer Chemotherapy
- Macmillan Cancer Support — Bowel cancer (including rectal cancer and colon cancer)
- ESMO — Colorectal Cancer: A Guide for Patients
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Fertility preservation before treatmentSperm banking, egg freezing and timing, step by stepSex and intimacy after colon cancerThe other conversation couples find hard to startShould young patients have genetic testing?What an inherited result would mean for future childrenMarriage conversations after young-onset colon cancerTalking to families about the future, honestly
Talk to us
Want to talk about fertility before treatment starts?
Tell us your diagnosis and where you are in treatment. We will help you raise fertility with your oncologist and arrange a referral to a fertility clinic if you want one. One helpline serves every CION centre.