*Dehydration can cause hypovolemia (low blood volume). *Low blood volume can cause someone to engage in self-stimulatory activities, such as drinking, which causes a release of adrenaline, and the heart will compensate for hypovolemia by pumping more blood. Dehydration: http://www.causeof.org/dehydrate.htm Hypovolemia http://www.causeof.org/suggother.htm#Hypovol Hypovolemia & Adrenaline Addiction http://www.causeof.org/suggother.htm#HypovolEffectsAdrenal Adrenaline http://www.causeof.org/adrenal.htm Chris 'The Cause of Internet Addiction' http://www.causeof.org