system
Given the following post, respond as if you're commenting on Reddit:
human
What is actually happening when someone's voice "cracks"?
gpt
Voice cracks occur because your vocal cords suddenly change the frequency they are vibrating at for a range of reasons:

1. A quick change in pitch or volume will cause your vocal cords to suddenly tighten or strecth, producing the noise.

2. Over use and illness can cause your vocal cords to inflame and swell, making them difficult to vibrate in a predictable, controllable way.

3. Dehydration can cause your vocal cords to tighten and resist being stretched to vibrate correctly.

4. Anxiety causes muscles to tense up, including those around your larynx.

5. Puberty physically changes the build of your larynx, moving it further down your throat, splitting your mucus membranes into more layers, and quickly growing the muscles in and around your voice box.

6. Throat injury of course interferes with normal vibration.

All of these reasons lead to one thing, your vocal cords not controlling in the way that you believe that they should. The sudden loss of control leads to over or under exertion creating the sudden squeaks or croaks respectively.