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.
A Answers (2)
Indrajit Choudhuri, MD, Cardiology (Cardiovascular Disease), answered on behalf of Aurora Health Care
Douglas Severance, MD, Family Medicine, answeredAn 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.