Breast cancer survivorship in pregnancy

Overview

This topic covers the health needs of women who have been treated for breast cancer in the past and are now pregnant or planning a pregnancy. It focuses on keeping both mother and baby safe, monitoring for any signs that breast cancer may have returned, and managing the unique emotions and physical changes that come with pregnancy after a cancer diagnosis.

It is not common, but more women are choosing pregnancy after breast cancer treatment. The exact number is not well known, but it is a growing area of care.

It affects women who have previously been diagnosed with breast cancer, usually during their reproductive years, and who are considering having or are already having a baby.

Symptoms

Common symptoms

• Tender or swollen breasts (common in early pregnancy)
• Fatigue
• Changes in breast size and shape

Symptoms in children

• This information is not about children of the survivor, but your child's health and development should be followed by their own doctor.

Symptoms in older adults

• This topic is not about older adults, as breast cancer survivorship in pregnancy typically occurs during reproductive years.

Causes

Main causes

• This is not a disease with a cause. It is a situation that happens when a woman with a history of breast cancer becomes pregnant.
• Natural hormone changes during pregnancy can affect breast tissue, which is why close monitoring is important.

Risk factors

• Having had breast cancer treatment in the past
• A history of hormone-sensitive breast cancer
• Had radiation therapy to the chest area earlier in life
• Being younger when treated for breast cancer, which often means longer survivorship ahead

When to see a doctor

See a doctor urgently if:

• If you are pregnant and have had breast cancer, see your healthcare provider urgently if you notice a new breast lump, skin changes, chest pain, shortness of breath, or unusual swelling.
• Contact your maternity unit or doctor right away for any heavy bleeding, severe pain, or fever.

Book a routine appointment if:

• Keep every prenatal appointment and your scheduled cancer follow-up appointments. These are separate but equally important.

Diagnosis

When you are already a breast cancer survivor, the focus is not on first-time diagnosis but on monitoring for any signs that the cancer has returned. During pregnancy, breast tissue changes naturally, which can make it harder to feel or see new changes. Your doctor may recommend tests that are safe during pregnancy if there are any concerns.

Tests that may be done

• Physical breast exam
• Breast ultrasound
• Mammogram (only if recommended and with protection for the baby)
• Blood tests to check general health and organ function
• Biopsy of any concerning area (if needed)

What to expect at your appointment

Your healthcare team will explain each test, why it is needed, and how it is safe for you and your baby. You can ask questions at any time and ask for a second opinion if you would like one.

Treatment

Treatment during pregnancy after a breast cancer diagnosis depends on many factors, including the type of cancer you had, the treatments you received, and how far along you are in pregnancy. Every plan is highly personalised and never rushed.

Self-care at home

• See your cancer specialist and maternity team regularly
• Rest when you need to
• Keep a notebook of any new symptoms or concerns
• Ask for practical help from family and friends

Medical treatments

If there are concerns about cancer during pregnancy, your oncology and maternity teams will work together. They may recommend imaging that is safe, and if treatment is needed, available options will be chosen carefully to protect both you and your unborn baby. This could include surgery, certain types of chemotherapy that are considered safer after the first trimester, or other therapies. Your specialists will explain all risks and benefits before any decision is made.

When is surgery considered?

Surgery is sometimes possible during pregnancy, especially in the second trimester, but your team will decide what is best for your situation.

Living with this condition

Pregnancy after breast cancer is a time of both joy and stress. It helps to keep your appointments, communicate openly with your doctors, and allow yourself to feel a range of emotions. You do not have to be positive all the time.

Lifestyle tips

• Stay active with your doctor's guidance
• Avoid alcohol and smoking
• Prioritise sleep and rest
• Seek support from those you trust

Diet and exercise

Eat a balanced diet with plenty of vegetables, fruit, wholegrains and lean protein. Gentle activities like walking and prenatal yoga are often safe, but confirm with your doctor.

Mental health and emotional wellbeing

You may feel anxious, worried, or overwhelmed at times. These feelings are very common. Talk to your doctor about your emotional health, and ask about counselling or support groups where you can share with other women who understand.

Prevention

You cannot prevent a past breast cancer diagnosis. But you can take steps to stay as healthy as possible during pregnancy, which may reduce the chance of complications.

Vaccines

Talk to your doctor about which vaccinations are safe and recommended during pregnancy.

Screening programmes

Your oncology team will recommend a follow-up schedule that includes regular checks for breast cancer recurrence, such as breast exams and imaging when needed.

Complications

If left untreated

• If new breast cancer signs are ignored, the chance of the cancer spreading could increase.
• If pregnancy complications are left untreated, both mother and baby could be at risk.

Long-term outlook

With careful, coordinated care, many women who have survived breast cancer go on to have healthy pregnancies and healthy babies. Your team will support you every step of the way, and there is every reason to be hopeful.

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