Colorectal cancer survivorship in pregnancy

Overview

This topic covers what it means to be a colorectal cancer survivor and then become pregnant or plan a pregnancy. After treatment for colorectal cancer, pregnancy is possible for some people, but it needs careful planning and support from a team of health professionals. Your cancer care team will work closely with your maternity team to keep both you and your baby as safe as possible.

It is not common. Colorectal cancer itself is rare in people of childbearing age, and even fewer become pregnant after treatment. But with advances in care, more survivors are able to consider pregnancy.

It affects people who have been treated for colorectal cancer and who can become pregnant. Both women and men who are survivors may be involved in a pregnancy, but this article focuses mainly on the person who carries the pregnancy. Partners and families are also affected and can be supported.

Symptoms

Common symptoms

• Persistent abdominal pain
• Bleeding from the back passage (rectal bleeding)
• Unexplained weight loss
• A lasting change in bowel habits, such as constipation or diarrhoea

Causes

Main causes

• Colorectal cancer can develop from abnormal growths (polyps) in the bowel lining over many years. Certain genetic conditions and lifestyle factors can increase the chance. As a survivor, pregnancy does not directly cause the cancer to return.

Risk factors

• Your past cancer treatments (surgery, chemotherapy, radiotherapy) and any lasting effects are important factors for needing extra care during pregnancy.
• If you have a genetic condition linked to colorectal cancer, such as Lynch syndrome, this may affect pregnancy planning and screening.

When to see a doctor

See a doctor urgently if:

• As soon as you know you are pregnant, or if you are planning a pregnancy, schedule an appointment with your primary care provider or oncology team.
• Tell your maternity team about your cancer history at your first prenatal visit.

Book a routine appointment if:

• See your doctor at all recommended prenatal visits and follow-up appointments for cancer survivorship.
• Your team may want to see you more often during pregnancy because of your history.

Diagnosis

Pregnancy in a colorectal cancer survivor is not a disease to diagnose. Instead, the focus is on a risk assessment. Your care team will review your cancer treatment history, your overall health, and any long-term effects from treatment.

Tests that may be done

• A review of your cancer treatment records and follow-up plan
• A physical examination, including checking your abdomen and blood pressure
• Blood tests to check your general health and organ function
• Imaging tests if needed, such as ultrasound or MRI, to monitor the baby and your organs (these are chosen to be safe in pregnancy)
• Screening tests for cancer recurrence as recommended by your team

What to expect at your appointment

You will meet with your cancer care team and your midwife or obstetrician. They will explain what monitoring you need during pregnancy, how to manage any long-term effects, and who to contact if you have concerns. You will be involved in every decision.

Treatment

There is no single treatment for survivorship in pregnancy. Care is about planning and managing your health during pregnancy. Your team may adjust follow-up scans or medications to keep you and your baby safe.

Self-care at home

• Attend all prenatal and cancer follow-up appointments
• Keep a record of any symptoms and share it with your team
• Get plenty of rest and ask for practical help at home
• Stay physically active as your team advises
• Talk to your pharmacist before using any over-the-counter medicines or supplements

Medical treatments

Medical care during pregnancy for cancer survivors is highly individual. If you need treatment for a new health problem, your doctors will choose options that are safe in pregnancy. This may include adjusting the dose of medicines you already take. Your oncology and maternity teams will work together to create a plan.

When is surgery considered?

Surgery is not usually needed during pregnancy unless there is a serious complication. If you have a stoma (an opening for waste) from previous surgery, your team will help you manage it as your pregnancy grows. Any surgery during pregnancy is only considered if the benefit outweighs the risks, and your team will explain everything.

Living with this condition

Day-to-day life during pregnancy as a cancer survivor can bring mixed emotions — joy and hope, along with worry. It can help to keep a simple routine, talk openly with your partner and family, and give yourself grace. You may need more rest than others, and that is okay.

Lifestyle tips

• Eat small, frequent meals to help with nausea or heartburn
• Drink plenty of fluids unless your doctor has told you otherwise
• Ask your care team before taking any vitamins or supplements
• Try gentle activities like walking or prenatal yoga if approved by your team
• Avoid smoking, alcohol, and recreational drugs

Diet and exercise

A balanced diet with plenty of fruits, vegetables, whole grains, and lean protein supports your health and your baby's growth. Fibre can help with constipation, but increase it slowly and drink enough water. Exercise such as walking can improve your energy and mood, but check with your care team before starting anything new.

Mental health and emotional wellbeing

Pregnancy after a cancer diagnosis can be a time of high anxiety. You may worry about your baby's health, your own health, and the future. These feelings are normal. It is important to talk about them — with your partner, a counsellor, or your care team. If you ever feel overwhelmed, hopeless, or have thoughts of harming yourself, reach out for urgent support.

Prevention

You cannot always prevent colorectal cancer from coming back, but you can reduce risks through regular follow-up, a healthy diet, physical activity, and avoiding smoking and excess alcohol. During pregnancy, the main goal is to stay in close contact with your care team and follow their monitoring plan.

Vaccines

Staying up to date with recommended vaccines can protect you and your baby from infections. Some vaccines are safe in pregnancy; others are not. Your obstetrician will tell you which ones are recommended for you. There is no vaccine to prevent colorectal cancer recurrence.

Screening programmes

As a survivor, you may have regular scans and blood tests to check for recurrence. During pregnancy, your team may adjust the timing of these tests to avoid risks to the baby. You will also have scheduled prenatal screening for your baby.

Complications

If left untreated

• If a cancer survivor does not have proper follow-up during pregnancy, a new or recurring cancer could be missed, or long-term effects from previous treatment could affect the pregnancy. This is why staying in care is so important.
• Untreated anxiety or depression can affect your well-being and your baby's development. Seek help early.

Long-term outlook

Many colorectal cancer survivors have healthy babies. With a dedicated healthcare team, careful planning, and good communication, the outlook is hopeful. Your experience makes you resilient, and you can be confident in asking for the support you need.

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