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Thyroid health is heart health

The gloved hands of a health professional check a woman’s throat for signs of thyroid issues.

Jan. 19, 2026— About 1 in 8 people in the U.S. will have a thyroid condition at some point, according to the American Thyroid Association. That matters: This tiny gland at the base of the neck releases hormones that affect your metabolism as well as every organ in your body—including the heart.

Hyperthyroidism and your heart

When the thyroid is overactive, it releases too much thyroid hormone into the body, a condition called hyperthyroidism. That affects the heart, circulation and nervous system. Hyperthyroidism can lead to increased heart rate and the feeling that your heart is racing, warns the American Heart Association (AHA). It can also raise your risk for:

  • Angina (chest pain).
  • Blood clots.
  • Stroke.
  • Heart failure.
  • Atrial fibrillation, a type of arrhythmia (abnormal heart rhythm).

Hypothyroidism and your heart

An underactive thyroid—which doesn't release enough thyroid hormone—is much more common than an overactive one. And, like hyperthyroidism, hypothyroidism can cause big problems. For one, it can lead to a slower heart rate. Hypothyroidism slows the metabolism, so it can also lead to weight gain—itself a risk factor for heart problems.

It can also increase your risk of:

  • High cholesterol.
  • Fluid retention.
  • High blood pressure.
  • Constricted blood vessels.

How to take care of your thyroid and cardiac health

To prevent thyroid problems from harming your heart health, it's important to take control of your condition and get the treatment you need.

That starts with knowing the symptoms—which can be subtle. Of the 20 million people in the U.S. who have a thyroid problem, more than half may not know it, reports the AHA.

Thyroid red flags vary, depending on which type of problem you have:

If you think you might have a thyroid condition, let your doctor know. They can run tests to see how well your thyroid is working. And treatment can help manage symptoms—and reduce health risks. That often involves medication.

Being aware of thyroid warning signs is just one way to look out for your heart health. Talk to your health care provider about how you can prevent heart disease.

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