Interesting comment regarding the "underactive thyroid (hypothyroidism) and Afib. There are numerous studies that say there is a correlation between hypothyroidism and Afib. More studies are being done but the information below just some of what is available on the web.

A few studies suggest that hypothyroidism is notably prevalent in AFib, potentially surpassing hyperthyroidism. For example, in a 2022 study of 2,000 people with AFib, researchers found that 10.5% had thyroid disease. Of those, 90% had hypothyroidism, 6.1% had hyperthyroidism, and 3.3% had typical thyroid function. Sep 13, 2023