Re: hear about the lady trying to win the Wii at the radio station See How Much Water You Can Drink Before You Pee contest.. she died. Water intoxication
I guess you could call it an electrolye imbalance, but its really just and osmotic imbalance.
Water outside the cells
Water and ions (Na, Mg, K) inside the cell
Semi-permeable membrane
You remember the rest from science class.