
Originally Posted by
Ntpadude
Actually everything... when you donate blood you sometimes are dizzy because of low blood pressure afterwards, then your kidneys absorb water to restore the pressure. Think of it like water pressure in pipes! When you take steroids your kidneys adjust things and cause you to not only make more red blood cells, sometimes more white blood cells as well, but also more fluid volume (increased # of pints of blood in your body) this causes bloating in other cells but all around increases BP. When you go off cycle and your body disposes of the extra water volume, so goes your blood pressure back to lower levels.