Because of their wide-ranging physiological importance, electrolyte deficiencies or imbalances can have very serious consequences, ranging from fatigue and muscle cramps to death. In fact, electrolytes are so important that an injection of the right amount of potassium can stop the heart dead in its tracks!
Generally speaking, minor electrolyte imbalances are not very symptomatic. Most people can display no symptoms and still have slightly elevated or diminished levels of most electrolytes on a blood test.
However, if an electrolyte imbalance escalates to the point that it becomes significant, it can be deadly. Because electrolytes play such critical roles in the nervous and cardiovascular systems, many of the symptoms of imbalance or depletion affect these same parts of the body.