Thyroid cancer, i.e. thyroid cancer, can normally allow breastfeeding after thyroid cancer surgery. Thyroid cancer itself is not contagious and will not be transmitted through breast milk, so breastfeeding will not be affected under normal circumstances. However, breastfeeding is not recommended in the early postoperative period. In the current clinical situation, some drugs, such as anesthetics, will be used in the surgery of thyroid cancer patients, which are not fully metabolized by the body in the early stage after the surgery, and will have certain adverse effects on the babies when they are breastfeeding. Moreover, some post-surgical thyroid cancer patients need to be treated with radionuclides, TSH suppression and external radiation therapy, etc. These radioactive treatments will cause the presence of radiotracer in the body, which will also have an adverse effect on the baby after breastfeeding. Whether breastfeeding is possible and whether it will affect the baby depends on the patient’s individual treatment, and it is recommended to ask the attending physician whether the patient’s condition is suitable for breastfeeding.