After thyroidectomy, numbness around the mouth and fingers with muscle cramps most likely indicates which electrolyte disturbance?

After thyroidectomy, numbness around the mouth and fingers with muscle cramps most likely indicates which electrolyte disturbance?

• A. Hyperkalemia
• B. Hyponatremia
• C. Hypercalcemia
• D. Hypocalcemia

Answer: (D)

Low calcium levels (hypocalcemia) explain numbness around the mouth and in the fingers with muscle cramps after thyroidectomy. The parathyroid glands, which regulate calcium via parathyroid hormone, are at risk during thyroid surgery. If they’re damaged or removed, PTH drops and calcium falls. Calcium helps stabilize nerve and muscle cell membranes; when calcium is low, nerves become more excitable, producing tingling around the mouth and in the extremities and causing cramps or tetany. You may also see signs like Chvostek or Trousseau, which reflect this increased neuromuscular excitability. This isn’t driven by potassium, sodium, or calcium elevation. Hyperkalemia typically causes muscle weakness and cardiac rhythm problems; hyponatremia leads to confusion and seizures; hypercalcemia causes weakness and constipation. The symptom pattern described—perioral numbness with muscle cramps—fits hypocalcemia best.

Low calcium levels (hypocalcemia) explain numbness around the mouth and in the fingers with muscle cramps after thyroidectomy. The parathyroid glands, which regulate calcium via parathyroid hormone, are at risk during thyroid surgery. If they’re damaged or removed, PTH drops and calcium falls. Calcium helps stabilize nerve and muscle cell membranes; when calcium is low, nerves become more excitable, producing tingling around the mouth and in the extremities and causing cramps or tetany. You may also see signs like Chvostek or Trousseau, which reflect this increased neuromuscular excitability.

This isn’t driven by potassium, sodium, or calcium elevation. Hyperkalemia typically causes muscle weakness and cardiac rhythm problems; hyponatremia leads to confusion and seizures; hypercalcemia causes weakness and constipation. The symptom pattern described—perioral numbness with muscle cramps—fits hypocalcemia best.