Is breast cancer safe in pregnancy?

Pregnancy can make breast changes harder to assess because breast tissue becomes denser and more sensitive. A new lump or other change still needs evaluation. Breast cancer is not spread to the baby simply because it occurs during pregnancy, but tests and treatments must be selected with fetal development in mind.

The plan depends on the cancer's type, size, spread, trimester and the person's wishes. Some imaging, surgery and medicines may be considered at particular stages, while other treatments are generally postponed until after delivery. A breast cancer team and maternity specialists should coordinate decisions.

Tell both your obstetric clinician and breast specialist about the pregnancy and any medicines you take. Keep scheduled assessments, bring prior imaging or biopsy reports, and ask how each test affects you and the fetus. Discuss timing of treatment, delivery planning, breastfeeding and emotional support before making changes to care.

Arrange prompt assessment for a persistent breast lump, nipple inversion, bloody discharge, skin dimpling, redness that does not settle, or a change that continues after feeding or hormonal fluctuations. Seek urgent help for severe pain, heavy bleeding, fainting, chest pain or breathing difficulty. These findings do not prove cancer, but delay can complicate assessment.

Ask which tests are suitable during pregnancy, whether a biopsy is needed, which treatments can be given now, what can wait until after delivery, and how the plan affects delivery and feeding.