Thyroid conditions are extremely common in the United States. It’s been estimated that 20 million Americans have some type of thyroid disease, with women being five to eight times more likely than men to develop one. One in eight women will end up having a thyroid disorder at some point in their life. Thyroid conditions can and often do occur in women during pregnancy, which poses the obvious question: can thyroid problems affect a baby’s development?
The answer is yes, and expecting mothers need to take extra precaution in making sure their thyroid levels are managed while pregnant. Hypothyroidism and hyperthyroidism, the two most common thyroid conditions, are heavily associated with multiple types of pregnancy and birth complications. Fortunately, with early diagnosis and treatment, there are medications you can take to control your thyroid without posing any risk to your baby. Read more below to find out what these conditions mean, how they affect your baby, and the treatment used to manage symptoms.
The thyroid gland is located on the front of your neck and wraps around the front of your windpipe in a butterfly-like shape. The thyroid plays an important role in making hormones that help your body function. It regulates your body’s metabolic rate, muscle control, brain development, bone maintenance, as well as heart and digestive function. It regularly secretes these hormones to keep the body in balance. Thyroid problems are known to be genetic, with 15 to 20 percent of cases of hypothyroidism being caused by inheritance. They can also be caused by mutations in certain genes involved in the production of thyroid hormones.
Thyroid problems usually begin when the gland produces too much or too little hormones. Once this happens, it can be diagnosed as a thyroid disorder. If you develop a thyroid disorder before pregnancy, this would be considered a pre-existing condition. Some mothers develop thyroid problems during their first pregnancy or soon after birth.
There is a wide range of different kinds of thyroid disorders, but hyperthyroidism and hypothyroidism make up the majority of diagnoses. These two conditions primarily focus on the abnormal production of hormones within the gland.
Some pregnant women are at an increased risk for a thyroid condition during pregnancy. Some of these risk factors are:
If you think you’re at risk for thyroid disorders during pregnancy, talk to your doctor about your family and medical history to get their opinion on how the disorder will affect your baby. Most thyroid disorders can be successfully managed with the right medications with no adverse effects on the baby.
Untreated thyroid conditions can lead to several different complications, before and after birth. This makes it even more important to manage your condition as early as possible.
Complications for pregnant women from hyperthyroidism can include:
Newborn complications from hyperthyroidism include:
Pregnancy complications from hypothyroidism differ slightly from hyperthyroidism, but there are some overlapping conditions.
Complications for pregnant women from hypothyroidism include:
Newborn complications from hypothyroidism include:
A doctor usually will not test for thyroid anomalies before pregnancy unless a woman is already at risk of developing one. This means an expecting mother should carefully monitor any signs or symptoms that can point to a problem with your thyroid. This can be difficult since some symptoms of thyroid disorders are similar to other harmless conditions. If you feel like you might have a thyroid disorder, a doctor will perform a physical examination and take blood samples to test your thyroid levels. The main things doctors look for in your blood results are the level of thyroid hormones and thyroid-stimulating hormones (TSH). The blood work will be able to confirm the diagnosis of either hypo/hyperthyroidism.
The primary goal for both types of thyroid disorders is to balance the amount of hormones being secreted throughout the body. There are many medications available that can manage thyroid production. If you have a thyroid condition before getting pregnant, talk to your doctor about whether the medication you’re taking is safe for your baby. The doctor may have to adjust your dosage or change the type of medication completely.
Mild hyperthyroidism may not need immediate treatment, as long as it’s not presenting any adverse symptoms. Moderate to severe cases will need an anti-thyroid medication. These medications will reduce the amount of hormones being produced. For pregnant women, the timing of these medications is very important. The two main drugs used for hyperthyroidism are called propylthiouracil and methimazole. Propylthiouracil must be used in the first trimester, as it can lead to liver problems if used in the second or third trimester. Methimazole, on the other hand, can only be used after the first trimester. Use of this medication in the first trimester may increase the risk of birth defects. Pregnant women should not use radiation therapy to treat their thyroid condition, because this can lead to the baby also developing a thyroid problem.
The main medication used to treat hypothyroidism is called Levothyroxine. This medication replaces the thyroid hormone that isn’t being produced enough. Levothyroxine has no adverse effects on your baby and is safe to take throughout pregnancy. For pregnant women who had a prior diagnosis of hypothyroidism, the dosage of your medication may need to be increased. Your thyroid levels can be regularly checked while adjusting the dosage to see what is most effective.
With proper management, thyroid disorders will not put your baby at risk of complications. There are thousands of mothers who have had a successful pregnancy and birth despite having a thyroid condition. The key to having a healthy pregnancy is by meeting with your doctor prior to or shortly after becoming pregnant to begin the necessary steps of treating the problem. Medication is usually the best way to regulate your thyroid levels and fortunately, several drugs are safe to take while pregnant. If you’re thinking about getting pregnant and have a pre-existing thyroid condition, speak to your doctor about the best ways to manage your symptoms during gestation.