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Potassium is a mineral and electrolyte that performs many important functions in the body. It regulates the heart's contractions and helps maintain muscle mass and function. Insufficient potassium levels -- hypokalemia -- are associated with an array of symptoms.

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1. Fatigue in Leg and Arm Muscles

Potassium plays a crucial role in regulating muscles function, and a deficiency can impair this action. The cessation of muscle function doesn't start right away but can escalate quickly. In some cases, an individual with a severe potassium deficiency may go from muscle fatigue to paralysis.

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