A large percentage of young women have thyroid cancer, and many of them are infertile. One of their concerns is whether they can get pregnant after thyroid cancer surgery. Is there any effect of taking thyroxine tablets on children and pregnant women? How to adjust the dosage and test the thyroid function? Can thyroid cancer be passed on to children? With my clinical experience, I would like to give some answers to patients who are concerned about this issue. Can thyroid cancer patients get pregnant? The answer is yes, thyroid cancer patients, for sure, can get pregnant. When can I get pregnant after thyroid cancer surgery? There is no definite conclusion in the literature about the timing of pregnancy when thyroid cancer is present. Medication adjustment usually takes 1-3 months For patients who are going to have iodine therapy after surgery, because iodine therapy has an effect on the reproductive glands, you need to consult the nuclear medicine physician who performs iodine therapy and decide the timing of pregnancy in conjunction with the dose and number of iodine therapy sessions. Are there any effects of taking thyroxine tablets on the child and the pregnant woman? First of all, it should be clear: thyroid cancer patients should take thyroxine tablets for a long time after surgery and should not just stop taking them blindly. Taking thyroxine after thyroid cancer surgery requires keeping tsh at a low level (the patient is in a subthyroid state), and taking it as required will not have any effect on pregnant women. Thyroxine tablets basically do not pass through the placenta, so they do not have any toxic effects on the fetus and do not cause malformations. How to monitor and adjust the dosage during pregnancy? During pregnancy, as the fetus grows, the mother’s demand for thyroid hormone will gradually increase and the dosage of thyroxine tablets may have to be increased. Therefore, patients need to regularly review and adjust the dosage of medication to meet the body’s demand for the hormone. Inadequate dosage of medication in pregnant women can lead to hypothyroidism, and hypofunction can affect the mental development of the fetus, and in serious cases, can cause fetal miscarriage, which must be avoided. Within 6 months of pregnancy: During this period, the fetus is not large, so pregnant women generally do not need to adjust the dosage of medication, but just review the thyroid function every 3 months and monitor it. After 6 months of pregnancy: During this period, the fetus increases dramatically in size and requires a review of thyroid function every two months to adjust the dosage of medication. If there are signs of decreased thyroid function, the thyroid function will be rechecked every month instead. Can I breastfeed normally after delivery? How to monitor and adjust the dosage during the period? After pregnancy and delivery, mothers can breastfeed their children normally. The amount of thyroid hormone secreted into the mother’s breast milk is very small and not enough to affect the child, nor will it suppress the child’s own thyroid hormone secretion, so the mother does not need to stop taking the medication during breastfeeding and can breastfeed her child without worry. During breastfeeding, the mother’s weight changes a lot and she may lose a lot of weight. Patients who increase the dosage of medication during pregnancy may have to reduce the dosage and request to review the thyroid function every 2 months, and then review it according to the review time required after thyroid cancer surgery after reaching the long-term maintenance dosage. Can thyroid cancer be hereditary? There is no definite evidence that papillary thyroid cancer is hereditary. Mothers do not need to worry that papillary thyroid cancer will be passed on to their children, and the medication used during pregnancy will not cause abnormal thyroid function in the fetus. So mothers with thyroid cancer, don’t give yourself too much burden of thought, treat it seriously and you can have a healthy baby.