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What are the medical terms called for these bodily happenings?

What is it called when your 'tummy goes' when you go over a hill in a car What is the term known as ice cream head called when you bite something cold What is it called when you od on wasabi or mustard known locally as mustard nose

Public Comments

1. interesting. I wouldn't be surprised if only the second condition has a medical term.
2. I don't know the first or the last. Oh, maybe the first one could be the G-Force? Like when you're on a rollercoaster. The second could be..brain freeze? Not exactly medical..but common?