The short answer
Cancer can happen during pregnancy, though it is uncommon. 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 during pregnancy is uncommon, but it does happen, and it can be treated.
The type and timing of treatment may be adjusted to protect the developing baby.
Some tests, like ultrasound and biopsy, are considered safe during pregnancy.
Certain treatments and scans are delayed or avoided during pregnancy because of risks to the baby.
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The full explanation.
The simple version
Finding out you have cancer during pregnancy is frightening. But it helps to know two things right away. First, cancer during pregnancy is uncommon. Second, it can be treated. Doctors have real experience caring for people in this situation.
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.
How pregnancy can change 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 is avoided in the weeks just before delivery.
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. Radiation therapy is often delayed until after the baby is born.
Treatment is not one-size-fits-all; it is shaped to fit the pregnancy.
Which tests are safe
Some tests are considered safe during pregnancy. For breast cancer, ultrasound does not use radiation and is often the first test for a lump. A biopsy, where a small tissue sample is checked, is also safe. Mammograms use only a small amount of radiation and can be used.
Other scans need more care. Tests like CT or PET-CT scans use more radiation or special dyes, so they are done only if truly necessary. When they are needed, steps such as shielding the belly are used to lower the baby's exposure.
Doctors choose tests that give answers while keeping the baby as safe as possible.
Finding cancer 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. For this reason, breast changes during pregnancy are sometimes checked later than they would be otherwise.
That is why it helps to stay aware of your body. If you notice a change that worries you, tell your doctor. 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.
Caring for yourself
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
- Call 911 or go to an emergency department if you have chest pain, sudden shortness of breath, a headache that will not go away, flashes of light or spots in your vision, or a seizure. These are urgent warning signs in pregnancy whether or not you have cancer (CDC).
- Call your maternity unit right away if your baby is moving less than usual, or the pattern of movement changes. Do not wait for morning (NHS).
- Call your maternity unit right away if you have any bleeding from the vagina, fluid leaking, or severe belly pain that does not ease.
- Phone your cancer team at once, at any hour, if your temperature reaches 100.4°F (38°C) or higher while you are having chemotherapy. Infection when blood counts are low is an emergency in its own right, and the CDC says to act on that reading immediately (CDC). Cannot reach them within minutes? Go to an emergency department and tell staff you are pregnant and on chemotherapy.
- Call your cancer team within a day or two if you have swelling, pain, or tenderness in one leg. Both pregnancy and cancer raise the risk of clots, so this is worth checking rather than watching.
Tell whoever answers that you are pregnant and having cancer treatment. Your two teams need to know the same facts.
Words to know
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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 and biopsy are considered safe, and mammograms use only a small amount of radiation. Scans that use more radiation or dyes, such as CT or PET-CT, are used only if truly needed, and steps are taken to shield the baby.
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. For breast cancer, early-stage disease is often treated much like it is in people who are not pregnant, with some timing changes. Certain chemotherapy may be given after the first three months but is avoided close to delivery.
Do I have to end the pregnancy to be treated?
Not usually. Many pregnancies continue during cancer treatment. Ending a pregnancy may be considered only when a cancer is fast-growing or advanced and treatment cannot wait. This is a personal decision made 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: 2026-08-18Next 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. 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.
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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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