How does a stomach bug/flu immediately turn everything I eat into hot lava?

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You probably know where I’m asking this from.

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>ELI5: How does a stomach bug/flu immediately turn everything I eat into hot lava?

That’s what **you** do on a regular basis. That’s just what the contents of your upper intestines look like.
All a stomach infection does is expel everything before your lower intestines have time to absorb all the fluids.

Your body thinks it’s being poisoned, so all the exit doors are held open and everyone is being forced to leave whether they wanted to or not.

The reason it burns your sensitive parts is because diareaha still has stomach acid, bile and a bunch of other digestive fluids in it. Your body is trying to get stuff out so fast that your intestines don’t have a chance to reabsorb all the fluids they normally do during digestion.