Eli5: Why do we yell when we throw up?
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Vomiting is caused by the muscles of the diagphragm clenching and pushing down hard on the stomach. Those same muscles are the ones most people naturally use when screaming or shouting (except to compress the lungs).
In addition, vomiting is associated with a feeling of discomfort, that may already be causing the person to moan or groan or vocalize in some other way.
Add those two together, and it can be easy to learn a “shouting” type thing during throwing up. But it can be unlearned, if one tries hard enough. Not everyone does it.
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