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Hello, @chickenfarmer My cardiologists, and the literature, have admitted for many years now that low thyroid (hypothyroidism) also causes heart arrhythmias, although it's not clearly understood why and how this occurs. Previously, it was believed that only high thyroid triggered atrial fib, and that was taught in med school for years. But it's a complex relationship between heart & thyroid. "Stop The Thyroid Madness" is a patient-centered website (and a book by that name) that has been compiling research on this and other thyroid questions and treatments for almost 25 years, and might be of interest to you. There are research studies discussed and other documentation of doctors who are studying the low-thyroid/afib connection. I found it helpful; I have low thyroid and AF episodes.

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Replies to "Hello, @chickenfarmer My cardiologists, and the literature, have admitted for many years now that low thyroid..."

@drdianeschneider Studies and experts suggest that thyroid medication (levothyroxine) is frequently overprescribed, especially for mild or subclinical hypothyroidism, with many patients potentially taking it unnecessarily due to vague symptoms, lab reporting issues, or a lack of re-evaluation, leading to potential risks like heart palpitations and anxiety, particularly in older adults. Reassessment for continued need and exploring other causes for symptoms are crucial, say health professionals.

I have Hashimoto's Syndrome which is a known trigger for hypothyroidism so for me there is not much of an option. But if a real trigger cannot be found, it may be worth looking into whether it is necessary.

@drdianeschneider my experience is different in that I find that hyperthyroidism causes arrhythmia. I am inherently hypo because my cancerous thyroid was completely removed. What I’ve found is that higher TSH reduces my arrhythmia problems - not sure how much hypo will help until TSH gets so high that arrhythmias start up again. That’s why I’m seeking a dr that knows these interactions and can help guide me to the optimum levothyroxine dose.