Voice cracks, voice breaks, you name it.
In: Biology
During puberty, your vocal cords are switching to a new vibration. When in transition, the rapid switch between vibrational levels causes a squeal similar to someone practicing a new note/chord switch and hitting it wrong.
Outside of puberty, stress (when angry or emotional) can remove focus from normal speaking technique and cause a similar squeal (also can increase cracks/squeals during puberty like when talking to a crush or during argument).
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