What is the "disease" that you have when you don't have any more electrolytes in their system?
Hyponatremia is the condition where the body does not have enough sodium (an electrolyte) A number of things can lead to hyponatremia: persistant diarrhea vomiting or edema, extreme endurance sports if electrolites are not replaced, or simply drinking way too much water.
lyme disease I think :P