When your bladder is full, it's a pretty good sign of being fully hydrated, which means that all your blood vessels (in particular the ones in your head) are all nice and full. Caffeine often eases people's headaches because it dilates your blood vessels slightly, relieving the pressure.
(no subject)
When your bladder is full, it's a pretty good sign of being fully hydrated, which means that all your blood vessels (in particular the ones in your head) are all nice and full. Caffeine often eases people's headaches because it dilates your blood vessels slightly, relieving the pressure.