Can I get pregnant if my thyroid is underactive?

Yes, but it is more difficult to conceive. There is also a risk of miscarriage.

Can I get pregnant if my thyroid is overactive?

Yes, but it is more difficult to conceive. If the overactivity is not treated there is a chance of miscarriage and premature delivery.

I’m hypothyroid. Should I continue to take my levothyroxine during my pregnancy?

Yes! In fact, it is necessary to increase your dosage 25-50 mcg during the first twelve weeks, or first trimester, of your pregnancy. Check with your GP.

I’m hyperthyroid and take carbimazole. Is this okay during pregnancy?

Propylthiouracil is the medication of choice during pregnancy for the first trimester only in hyperthyroid (overactive) patients. Carbimazole is the drug used during the rest of pregnancy.

I have been treated with radioiodine for an overactive thyroid. Will this harm the baby?

You should not get pregnant for 6 months after this treatment. If you are in doubt check with your GP

I have Graves’ disease treated by surgery and am taking levothyroxine. Are there any problems for the baby?

Firstly you should increase the dose of thyroxine during pregnancy. There is also a very small chance that the baby could be born with an overactive thyroid but if so it would only last for about one month and can be treated easily. A blood test during the later part of pregnancy will indicate if there is a high risk of this.

Can I take antenatal vitamins if I have thyroid disease and take medication?

Yes! Take your antenatal vitamins, but avoid taking them at the same time you take your thyroid medication. Some (calcium, for example) interfere with the absorption of thyroid medication in your system.

I’ve heard that you can develop thyroid disease after you have a baby?

Up to 9% of women can develop postpartum thyroid disease. Sometimes this is a temporary condition. It can be treated with levothyroxine.  In some cases the thyroid disease remains a permanent condition.

Can I breast-feed my baby if I am on levothyroxine or anti-thyroid medication?

Yes. There might be a small amount of the medication in your milk, but not enough to harm the baby.