Thyroid And Pregnancy

    Your thyroid is a little gland in the front of your neck, just below your larynx or "voice box". The thyroid gland is one of the "endocrine glands", and it makes hormones to regulate physiological functions in your body.

    The thyroid gland manufactures thyroid hormone, which regulates the rate at which your body carries on its necessary functions. Other endocrine glands are the pancreas, the pituitary, the adrenal glands, the parathyroid glands, the testes, and the ovaries.

    Diseases of the thyroid gland especially when getting pregnant and during pregnancy are very common, affecting millions of Americans. 


    The first step in diagnosing thyroid disease is to get a good history and examination. However, the actual diagnosis of thyroid disease is based on laboratory tests, because many of the usual thyroid symptoms such as fatigue, weight change, heat intoilerance, constipation, and menmstrual irregularities are also seen among individuals who are normal and who have no throid disease. 

    History and Examination

    • Feel the neck
    • Listen by stethoscope to the throid gland
    • Tests reflexes
    • Checks blood pressure, heart rate, and rhythm
    • Measure your height and weght and calculate the BMI body mass index
    • Examine face, eyes, nose, skin, nails, hands

    Review of Clinical Signs of Thyroid Disease

    • Over/Underweight
    • Intolerance to cold
    • Intolerance to warmth

    Common Symptoms:

    Hypothyroid Hyperthyroid
    • Constipation
    • Slower thinking
    • Weight gain
    • Fatigue
    • Lack of energy
    • Heavy menstrual periods


    • Loose bowel movements
    • Jitterness, shaking
    • Weight loss
    • Feeling hot
    • Fatigue
    • Shorter/Lighter menstrual periods

    The blood test for thyroid disease consists of the following:

    • TSH - Thyroid Stimulating Hormone)
    • Anti-thyroid Niscrosomal Antibody Testing
    • Total T4/ Total Thyroxine
    • Free T4 / Free Thyroxine
    • Total T3 / Total Triiodothyronine
    • Free T3 / Free Triiodothyronine
    • Thyroglobulin/Thyroid Binding Globulin/TBG
    • T3 Resin Uptake (T3RU)
    • Reverse T3
    • Thyroid Peroxidase Antibodies (TPOAb) / Antithyroid Peroxidase Antibodies
    • Antithyroid Microsomal Antibodies / Antimicrosomal Antibodies
    • Thyroglobulin Antibodies / Antithyroglobulin Antibodies
    • Thyroid Receptor Antibodies (TRAb)
    • Thyroid-Stimulating Immunoglobulins (TSI)

    Imaging Tests

    • MRI or CT Scan
    • Thyroid Ultrasound
    • Nuclear scan/Radioactive Iodine Uptake (RAI-U)

    Diseases of the thyroid:

    •  Hyperhyroidism - An over-active gland where the thyroid makes too much hormones
    • Hypothyroidism - An under-active gland that makes not enough hormones.
    • Hashimoto’s Disease
    • Hyperthyroidism
    • Graves’ Disease
    • Goiter
    • Nodules
    • Thyroid Cancer

    An enlarged thyroid gland is often called a "goiter." Sometimes an inflammation of the thyroid gland (Hashimoto's disease) will cause enlargement of the gland.

    An abnormal thyroid function before and during pregnancy, either too much or too little hormone can have a major effect both on your fertility and the developing baby. Obviously, it's best to diagnose and treat thyroid problems before pregnancy; that way, you'll improve both your fertility and your chance for a good pregnancy outcome.  Making the diagnosis and treating it can significantly enhance your chances having a healthy baby.

    If your periods are irregular and you have trouble conceiving, hypothyroidism could be the cause of the fertility problem. If you get pregnant anyway, hypothyroidism increases your risk of miscarriage, and the baby could also have problems.

    Hypothyroidism is a condition in which the body lacks sufficient thyroid hormone. As many as one in 10 women have some form of hypothyroidism before or during pregnancy, though most don't realize they have it.

    The classic symptoms of hypothyroidism are:

    • Lethargy, fatigue, weakness
    • Weight gain or increased difficulty losing weight
    • Dry skin
    • Hair loss
    • Cold intolerance
    • Constipation
    • Depression
    • Decreased libido
    • Reduced heart rate
    • Development of goiter

    The problem is that most women with hypothyroidism have few or none of these symptoms.

    Instead, when you have an abnormal thyroid function during pregnancy you may experience more subtle ones such as weight gain, skin problems, abnormal menstrual cycles (irregularity, heavy periods, loss of periods, or dysfunctional uterine bleeding).

    Because some symptoms of hypothyroidism -- tiredness and weight gain, for example -- are already quite common in pregnant women, it's often overlooked as a possible cause of these symptoms.

    Babies born to mothers with untreated hypothyroidism during pregnancy have been found to have lower IQs. That's why some doctors suggest that all pregnant women and those planning to become get pregnant routinely be tested for hypothyroidism. All it takes is a simple blood test that measures thyroid-stimulating hormone (TSH). High levels of TSH indicate hypothyroidism and inadequate thyroid function.
    In many cases, no specific cause can be found. The illness may follow an infection of the thyroid or an autoimmune condition, such as Hashimoto's disease, or it could result from surgical removal of parts, or all, of the thyroid.

    Treatment for hypothyroidism in pregnancy is easy. You take one pill daily of a synthetic thyroid hormone and continue taking it throughout pregnancy. It usually takes about eight weeks for thyroid function to return to normal on the drug. As long as the proper dose is prescribed, neither mother nor baby should suffer side effects. Women with previously treated hypothyroidism may have to increase their dose of medication during pregnancy.