motion sickness
migraines
sleeping sickness
food poisoning
their sense of balance doesn’t change
their sense of balance gets worse
their sense of balance gets better
regular gravity
microgravity
zero gravity
legs and arms
torso and head
lungs
stomach
eating
interacting
walking
talking
legs
brains
hands
muscles
it speeds up
it slows down
it swells with fluid before shrinking
nothing, it stays the same