What Are the Common Signs of Low Potassium?


Quick Answer

Signs of low potassium include abnormal heart rhythms or palpitations, fatigue or muscle weakness, constipation, muscle damage, and tingling or numbness, according to MedlinePlus. A minor decrease in potassium levels may not cause symptoms.

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What Are the Common Signs of Low Potassium?
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Full Answer

Potassium is necessary for nerve and muscle-cell function, including cells in the heart. The normal range for potassium is 3.6 to 5.2 millimoles per liter, states Mayo Clinic. A potassium level below 2.5 millimoles per liter is low and may cause life-threatening side effects.

A large drop often slows the heart rate, warns MedlinePlus. The initial signs of a slowed heart rate due to low potassium include feeling faint or lightheaded. In cases of extremely low potassium, the heart can stop completely.

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