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Sydney Ross Singer's avatar

Here is another piece of the puzzle: "In hypothyroidism, the sluggish thyroid may contribute to a lower pitch and a sense of vocal fatigue. Conversely, hyperthyroidism, with its accelerated metabolism, might elevate pitch and introduce a jittery quality to your voice.” https://thethyroidinstitute.com/how-the-thyroid-can-affect-your-voice/

This means that low thyroid results in different vibrations of the vocal cords, lowering the frequency, while high thyroid raises the frequency. This can be functionally significant in that frequency can influence thyroid release due to sympathetic vibration. Low frequencies may release more thyroid than higher frequencies. This can be tested.

Note that the thyroid is responsible for the development of the vocal cords. "Thyroid hormones influence the growth and development of these vocal structures, contributing to the pitch, tone, and overall quality of your voice.” (ibid)

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