In space, the zero gravity causes all your bodily fluids to move towards your head. This can often cause a headache which can best be alleviated by urinating.– WTF Fun Facts
WTF Fun Fact – Space Headache
In space, the zero gravity causes all your bodily fluids to move towards your head. This can often cause a headache which can best be alleviated by urinating.– WTF Fun Facts
Urination is from the bladder, once water has passed through the kidneys into the bladder that water has nothing to do with blood pressure. The fluid in your bladder is essentially OUTSIDE of your body only be held for convenient disposal. So there can be no effect on a head ache. Where did you hear this?