Which symptom is commonly associated with hypokalemia?

Which symptom is commonly associated with hypokalemia?

• A. Hypertension
• B. Hyperglycemia
• C. Muscle weakness
• D. Bradycardia

Answer: (C)

Potassium is essential for normal muscle cell excitability and cardiac conduction. When potassium levels drop, the resting membrane potential becomes harder to reach the threshold for contraction, so skeletal muscles don’t contract as effectively. This presents mainly as generalized weakness, with fatigue and cramps, and can progress to weakness or even paralysis in severe cases. That makes muscle weakness the symptom most commonly associated with hypokalemia. Hypertension isn’t a direct symptom of low potassium, though long-term potassium balance can influence blood pressure. Hyperglycemia isn’t a typical feature of hypokalemia, and bradycardia is not characteristic—low potassium more often predisposes to tachyarrhythmias rather than slower heart rates.

Potassium is essential for normal muscle cell excitability and cardiac conduction. When potassium levels drop, the resting membrane potential becomes harder to reach the threshold for contraction, so skeletal muscles don’t contract as effectively. This presents mainly as generalized weakness, with fatigue and cramps, and can progress to weakness or even paralysis in severe cases. That makes muscle weakness the symptom most commonly associated with hypokalemia.

Hypertension isn’t a direct symptom of low potassium, though long-term potassium balance can influence blood pressure. Hyperglycemia isn’t a typical feature of hypokalemia, and bradycardia is not characteristic—low potassium more often predisposes to tachyarrhythmias rather than slower heart rates.