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A member asked:
Why does an over active thyroid cause your heart to beat fast
A doctor has provided 1 answer
Sympathetic nerves: Thyroid hormone stimulates the sympathetic nervous system. Increased sympathetic nervous system activity increases the heart rate. There is also evidence that thyroid hormone acts on the heart muscle directly to increase the strength of contraction and the rate of contraction (makes it beat harder and faster).
Answered 10/16/2016
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