why does voice get a lot deeper when you are sick
In: 2
Depending on the illness, your upper respiratory system will swell up and/or be covered in extra mucus. This causes your vocal chords to vibrate slower and at a lower frequency.
[More here.](https://www.scienceabc.com/humans/why-does-your-voice-change-when-you-have-a-sore-throat.html)
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