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* Fatigue.
* Muscle damage (rhabdomyolysis).
* Muscle weakness or spasms(but not [[Cramps]]).
* Paralysis (which can include the lungs).
I have seen an ultrarunner need urgent medical attention because they attempted to complete 100 mile race soon after a serious digestive tract upset. The nausea and vomiting the previous week had left them potassium depleted, which resulted in their collapse at an aid station.