Why does putting your fingers down your throat make you sick?

Answer:
Your causing your gag reflex to work.

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You are stimulating your gag reflex which in turn creates pressure on your brain and a singnal is then sent from your brain to vomit. It is a very deep rooted response of the body.

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definitely stimulates your gag reflex. not a good idea to stick your fingers down your throat !

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Now why would you want to go doing that?

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You are stimualting what is called the glasopharangeal nerve, also called the Gag Reflex nerve, at the back of your throat and nose (oropharngx).
It then creates an uncontrolable uge to explell your stomach contents.

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