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What is the link between atrial fibrillation (AFib) and thyroid disease?

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There's a greater link between atrial fibrillation (AFib) and thyroid disease than you might think.

When your thyroid is too active, it's called hyperthyroidism. You get more hormones than you need. Everything speeds up, including your heart.

If you take thyroid replacement hormone, a dose that's too high can cause the same issue.

And that rapid heartbeat can lead to AFib, where the top chambers of your heart start to quiver and it can't pump as much blood as normal.

SOURCES:

Hormone Health Network: "What Does the Thyroid Gland Do?"

UpToDate.com: "Patient education: Hypothyroidism (underactive thyroid) (Beyond the Basics)."

Harvard Health Publications, Harvard Medical School: "Thyroid disorders and heart conditions: What's the connection?"

AllThyroid.org: "Heart Problems: Arrhythmias including atrial fibrillation, mitral valve prolapse."

Medscape: "Thyrotoxic Atrial Fibrillation."

Mayo Clinic: "Hyperthyroidism (Overactive Thyroid)," "Atrial Fibrillation."

NIH, National Institute of Diabetes and Digestive and Kidney Diseases: "Hyperthyroidism (Overactive Thyroid)," "Thyroid Tests."

NIH, National Heart, Lung, and Blood Institute: "How Is Atrial Fibrillation Diagnosed?"

American Heart Association: "What are the Symptoms of Atrial Fibrillation (AFib or AF)?"

Columbia University: "Radioactive Iodine."

Reviewed by James Beckerman on July 25, 2017

SOURCES:

Hormone Health Network: "What Does the Thyroid Gland Do?"

UpToDate.com: "Patient education: Hypothyroidism (underactive thyroid) (Beyond the Basics)."

Harvard Health Publications, Harvard Medical School: "Thyroid disorders and heart conditions: What's the connection?"

AllThyroid.org: "Heart Problems: Arrhythmias including atrial fibrillation, mitral valve prolapse."

Medscape: "Thyrotoxic Atrial Fibrillation."

Mayo Clinic: "Hyperthyroidism (Overactive Thyroid)," "Atrial Fibrillation."

NIH, National Institute of Diabetes and Digestive and Kidney Diseases: "Hyperthyroidism (Overactive Thyroid)," "Thyroid Tests."

NIH, National Heart, Lung, and Blood Institute: "How Is Atrial Fibrillation Diagnosed?"

American Heart Association: "What are the Symptoms of Atrial Fibrillation (AFib or AF)?"

Columbia University: "Radioactive Iodine."

Reviewed by James Beckerman on July 25, 2017

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