According to a new study for patients who take medication to treat hypothyroidism being treated with too much medication can lead to an increased risk of Atrial fibrillation a common heart rhythm disorder associated with stroke. The findings were presented by researchers from the Intermountain Medical Center Heart Institute in Salt Lake City at the American Heart Association Scientific Session conference in Chicago. We know patients with hypothyroidism have a higher risk of atrial fibrillation but we didn't consider increased risk within what's considered the normal range of thyroid hormones. These findings show we might want to reconsider what we