Temporarily shrinks because it's lack of water for hydration for hyponatremia caused by overconsumption of water in a short amount of time athletes are off and the victims of clover because of complications deleting the water levels
Extreme physical conditions where is the dehydrated brain himself the production of antidiuretic hormone over hydrated brain slows or even stops releasing it into the blood sodium electrolytes in the body become diluted causing cells to swim in severe cases kidneys can't keep up with the resulting volumes of Karen water intoxication that occurs possibly causing headache and in rare instances seizures that's pretty extreme situation