doctor here:
body senses you’re about to throw up, you salivate before you do to protect the linings of your throat and teeth from the stomach acids. the saliva forms a slight barrier in that sense.
the feeling underneath the jaw could be a few things:
– your salivary glands working
– your throat muscles tightening to “seal off” your windpipe so the food you swallowed earlier doesn’t go into your lungs
hope this helps!
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