A Answers (3)
It is possible for thyroid disease to cause atrial fibrillation (AFib), but not in most cases. If you are diagnosed with atrial fibrillation, your doctor will probably check your thyroid to make sure it’s functioning properly.
An overactive thyroid (hyperthyroidism) can lead to atrial fibrillation. Too much thyroid hormone can impair the ability of cells in your heart to transmit electrical impulses well. One in 10 people with an overactive thyroid experience atrial fibrillation. In many cases, bringing the thyroid problem under control can control the atrial fibrillation, too.
Patients with both an overactive AND underactive thyroid can have atrial fibrillation, an abnormal heart rhythm, but it is hard to identify whether the thyroid disease is the actual CAUSE of the atrial fibrillation, unless there are no other possible contributors.
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