It is possible to breastfeed with hyperthyroidism, and breastfeeding is contraindicated while taking medication. The small amount of thyroid hormone contained in breast milk is very low compared to the infant’s daily thyroid hormone requirement, and the thyroid hormone ingested through breastfeeding has a minimal effect on the infant, and does not interfere with normal breastfeeding as long as the infant’s thyroid function is normal. If you are using medications for hyperthyroidism, such as methimazole and propylthiouracil, methimazole is contraindicated during breastfeeding, so breastfeeding is not recommended during treatment with medications. Specific hyperthyroidism after whether you can breastfeeding, try to go to the hospital to consult the doctor in detail, so that the doctor according to the specific situation, guidance on drug treatment, breastfeeding and so on.