The short answer
Cancer can happen during pregnancy. Doctors can treat cancer while a person is pregnant, but the type and timing of treatment may change to protect the baby. Some tests and treatments are safe during pregnancy, while others are delayed or avoided. Care is planned around both the pregnancy and the cancer.
Cancer can be found during pregnancy, and it can be treated.
The type and timing of treatment may be adjusted to protect the developing baby.
Some tests, like ultrasound, mammograms and MRI with limited dye, can be used safely during pregnancy.
Certain treatments and scans are delayed or avoided during pregnancy because of risks to the baby.
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The simple version
This page is for anyone who finds out they have cancer while pregnant, and for the people close to them.
Finding out you have cancer during pregnancy is frightening. But it helps to know two things right away. First, it can be treated. Second, doctors have a plan for it. Your team will plan care around both you and the baby.
Much of what we know comes from breast cancer, which is one of the more common cancers found during pregnancy. The ideas below use that example. But the details always depend on the type of cancer and your own situation.
Cancer during pregnancy can be treated, with a plan built around both you and your baby.
Why cancer can be hard to find during pregnancy
Cancer can be harder to spot during pregnancy. Normal pregnancy changes, such as fuller, more tender, and lumpier breasts, can hide a small lump. Because of this, breast cancer is often found at a later stage during pregnancy.
That is why it helps to stay aware of your body. If you notice a change that worries you, tell your doctor right away. Regular check-ups during and after pregnancy are also a good time to raise any concerns.
Knowing your own body and speaking up early both matter.
Which tests are safe during pregnancy
Once a change is found, doctors need tests to check it. Some tests are considered safe during pregnancy. For breast cancer, ultrasound does not use radiation and is often the first test for a lump. Mammograms use only a small amount of radiation and can be used safely. MRI with limited use of dye can also be used.
Other scans need more care. Tests like CT or PET-CT scans use radiation, dyes or tracers that may be dangerous for the baby. Steps such as shielding the belly are used to keep exposure as low as possible.
Doctors choose tests that give answers while keeping the baby as safe as possible.
How pregnancy can change treatment
After the tests, your team plans treatment. The goal is to treat the cancer well while protecting the developing baby. To do that, the type of treatment and its timing may be adjusted.
For breast cancer, early-stage disease is often treated much like it is in people who are not pregnant, with some changes in timing. Some steps, such as certain surgery, can be done during pregnancy. Certain chemotherapy may be given after the first three months of pregnancy, but it should be avoided 3 to 4 weeks before delivery. Chemotherapy at this time does not usually harm the baby, but it may cause early labor or low birth weight.
Some treatments are usually not given during pregnancy at all, because they can harm the baby. For breast cancer these include hormone therapy, targeted therapy, and immunotherapy. Waiting until after the baby is born is usually the safest choice for radiation therapy.
Treatment is not one-size-fits-all; it is shaped to fit the pregnancy.
Caring for yourself and finding support
A cancer diagnosis during pregnancy is hard in both body and mind. You do not have to carry it alone. Your care team is there to answer questions at every step.
Beyond your medical team, support can come from family, one-on-one counseling, and in-person or online support groups. Many people find that having a clear plan and a place to share their worries makes the road easier.
Support for your feelings is part of good care, not an extra.
When to get help sooner
The CDC says to get medical care right away for urgent warning signs during pregnancy. These can be signs of a life-threatening problem (CDC).
- Call 911 or go to the ER if you have chest pain, trouble breathing, a headache that will not go away or gets worse, flashes of light or spots in your vision, fainting, or a seizure. Do not drive yourself.
- Get care right away if your baby has stopped moving or is moving less than before. A change in movement is what matters.
- Get care right away if you have bleeding from the vagina that is more than spotting, fluid leaking, or severe belly pain that does not go away.
- Get care right away if you have swelling, pain, or tenderness in one leg or arm. Both pregnancy and cancer raise the risk of clots.
- Call your doctor right away, at any hour, if your temperature is 100.4°F (38°C) or higher while you are having chemotherapy. Per CDC, a fever during chemotherapy is a medical emergency, and it can be the only sign of infection (CDC). If you cannot reach them, go to the ER. Tell staff you are pregnant and on chemotherapy.
- Get care right away if you have thoughts of harming yourself or your baby.
For any other emergency, call 911 or go to the ER. Tell whoever answers that you are pregnant and having cancer treatment. Your two teams need to know the same facts.
Sources
Common questions
Can cancer be treated while I am pregnant?
Yes. People can be treated for cancer during pregnancy. The type of treatment and when it is given may be affected by the pregnancy so the baby is protected. A care team plans treatment around both the cancer and the pregnancy.
Are cancer tests safe during pregnancy?
Some are. For breast cancer, ultrasound uses no radiation. Mammograms use only a small amount and can be used safely. MRI with limited use of dye can also be used. CT or PET-CT scans may be dangerous for the baby, so steps such as shielding the belly are taken to keep exposure as low as possible.
Will cancer pass to my baby?
For breast cancer that has not spread, NCI notes the cancer does not appear to harm the fetus, and breast cancer cells do not seem to pass from the mother to the baby. Each cancer type is different, so ask your team about your situation.
Does treatment change depending on the trimester?
It can. With early-stage breast cancer, the plan often looks similar to the plan for someone who is not pregnant, but the timing may shift. Some chemotherapy can be given after the first 3 months, and it should be avoided 3 to 4 weeks before delivery.
Do I have to end the pregnancy to be treated?
For breast cancer, NCI says ending a pregnancy does not necessarily improve the chance of survival. This depends on the type of cancer and the stage. It is a personal decision to talk through with your care team.
Who helps plan my care?
A team that may include cancer doctors, your pregnancy care provider, and others works together. Counseling and support groups can also help with the emotional side of a diagnosis during pregnancy.
Questions to ask your doctor
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Last updated: 2026-09-29Next planned review: 2028-07-14
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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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