Eli5 why do we produce a lot more saliva right before we vomit?

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I’m currently suffering with a nasty sickness bug and was wondering why my mouth fills with saliva right before I vomit?

NSFW just incase

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Anonymous 0 Comments

I had hyperemesis gravidarum when pregnant and had to carry a cup around for 5 months to spit out my excess saliva. Mouth would fill up as if I took a swig of water.

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