Hyperthyroidism is what happens when your thyroid gland is producing too much thyroid hormone and your body is running on overdrive.

Hyperthyroidism is more common in women, but the reasons are unknown. The symptoms of an overactive thyroid, regardless of the cause, are basically the same, but hyperthyroidism treatment recommendations may vary depending on the diagnosis.

  • Graves’ Disease is an autoimmune condition and the most common cause of an overactive thyroid. Thyroid antibodies attack your thyroid gland so that the body’s immune system over stimulates the thyroid gland to produce excessive amounts of thyroid hormone.
  • Subclinical Hyperthyroidism is when your labs are mildly abnormal but you do not experience any symptoms. Depending on your age, other medical problems, and labs values, this may or may not need treatment.
Symptoms

Hyperthyroid Symptoms

The most common hyperthyroidism symptoms include:

  • Racing heart rate
  • Palpitations
  • Anxiety
  • Insomnia
  • Nervousness
  • Weight loss with increased appetite
  • Excessive sweating / heat intolerance
  • Muscle weakness
  • Abnormal menstrual cycles in premenopausal women.

Other overactive thyroid symptoms may include:

  • Abnormal blood pressure
  • Heart arrhythmias

Graves’ disease symptoms may also include:

  • Eye problems such as inflammation, swelling, and bulging of the eyes
  • Rare skin disease in the form of reddish, lumpy thickening on the shins
Diagnosis

Hyperthyroidism Diagnosis

The best test to diagnose an overactive thyroid is a blood test called TSH (thyroid stimulating hormone).

  • TSH will be low if the thyroid is working too much.

If your TSH is found to be abnormally low (giving you a presumptive diagnosis of hyperthyroidism), other blood tests may include:

  • FT4 (free T4)
  • TT3 (total T3)
  • Thyroid antibodies (TSI, TRAB) – are useful in Graves disease diagnosis and monitoring of Graves disease treatment

If a thyroid nodule is palpated and you have hyperthyroidism, your thyroid endocrinologist may order a thyroid ultrasound or a thyroid uptake scan.

Treatment

Hyperthyroidism Treatment

Hyperthyroidism can be treated with anti-thyroid medication, radioiodine treatment (RAI), or thyroid surgery (thyroidectomy).

Most patients will be started on anti-thyroid medication initially to control symptoms of hyperthyroidism. Your physician will then discuss with you the risks and benefits of all three options and help you decide which is most appropriate to achieve a long-term cure. Patients with Graves’ eye disease should be seen by an ophthalmologist for further evaluation.

Can diet or any complementary therapies treat an overactive thyroid?

  • In general, there are no randomized controlled trials demonstrating that diet or any complementary therapies significantly alter thyroid function or successfully treat thyroid cancer, hypothyroidism or hyperthyroidism.
  • However, there are some programs that discuss ‘thyroid healthy’ foods and lifestyles. In general, most cause no harm, but they also have no proven benefit.

Hyperthyroidism and Pregnancy

The levels of thyroid hormone circulating in the body fluctuate normally during pregnancy. However, maternal hyperthyroidism during pregnancy develops in about 1/1,500 pregnancies, most commonly from Graves’ disease.

Hyperthyroidism during pregnancy needs to be treated and addressed to prevent complications such as early labor or pre-eclampsia in the mother and prematurity, fast heart rate, congenital defects, or neonatal hyperthyroidism in the fetus. Treatment during pregnancy depends on the severity of the disease. Mild hyperthyroidism is many times only closely monitored whereas moderate or severe disease will be treated with antithyroid-medications or rarely surgery. Hyperthyroidism can also occur in the postpartum period and when it does, it is usually followed by hypothyroidism.

Pregnant woman

When to See a Provider

You should see your provider to schedule blood tests if you newly experience any of the symptoms mentioned above.