: Does Potassium Deficiency Really Cause Cramps? Accordign to Ace Fitness, it is a myth that potassium deficiency causes cramps, since there isn't enough potassium in sweat to deplete potassium. Sodium deficiency is blamed

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There is no single cause of cramps, but there are several known causes. Both WebMD and Ask.com have overlapping reasons.

Poor blood circulation
Overexertion of a muscle
Exercising in the heat
Dehydration
Potassium/Magnesium deficiency
Malfunctioning nerves

I remember reading a long time ago that it's less about a potassium/magnesium deficiency and more about an imbalance between those minerals and sodium. What the article you linked to fails to recognize is the involvement of those minerals in the muscle itself. It's not sweated out because it is used as your muscles work.