Breast cancer patients should not become pregnant until they are cured. Pregnancy will affect the patient’s nutrition and physical strength. At this time, the patient still needs intermittent maintenance treatment, and the drugs are mostly cytotoxic drugs with toxic effects on the fetus, which can cause fetal malformation, miscarriage, and premature birth, and if the pregnancy has already occurred, attempts should be made to terminate the pregnancy as soon as possible. Clinical data proves that pregnancy can contribute to the recurrence and metastasis of breast cancer, which also brings many difficulties to the treatment and affects the efficacy. Patients with breast cancer, whether they can get pregnant or not, should be consulted by breast oncology and gynecology experts, and pregnancy can be considered if it really does not affect their health and they have the ability to bear children in pregnancy. In some patients, the cancer is found during pregnancy, at this time, the pregnancy should be terminated quickly to protect the pregnant woman and treat the cancer early; if the delivery is near, the delivery can also be induced or caesarean section, and then the cancer can be treated. The specific situation should be consulted with breast oncology and obstetrics and gynecology specialists.