What are the common signs of low potassium?

By Forinfos - 10/05/2026 - 0 comments

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.

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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