Fatigue
Every cell in the human body requires potassium to function optimally. Any time the balance of potassium is upset, your cells will become more easily fatigued—and that leads to noticeable lethargy.
However, there are a number of conditions unrelated to hypokalemia that also cause fatigue, so you should consider other symptoms on this list if you are feeling more tired than usual. Also, consider your lifestyle. If you find that you feel exhausted after a workout, for example, or know you are getting enough sleep but cannot wake up, low potassium may be the cause.
