Which symptom would you expect in hyponatremia due to neurological effects?

Which symptom would you expect in hyponatremia due to neurological effects?

• A. Confusion
• B. Hypertonia
• C. Flushing
• D. Hypertension

Answer: (A)

When hyponatremia affects the nervous system, the low extracellular osmolality pulls water into brain cells, causing cerebral edema and impaired neuronal function. This swelling disrupts mental status, leading to confusion as an early and common neuro symptom. As hyponatremia worsens, more severe neurologic signs such as seizures or coma can occur.

So the symptom you’d expect from neurological effects is confusion because it reflects brain dysfunction from cellular swelling and impaired neuronal activity.

Flushing, hypertension, and increased muscle tone aren’t typical direct neuro effects of hyponatremia. Flushing relates to skin vasodilation, hypertension to blood pressure status, and hypertonia to increased muscle tone—none capture the brain-wide dysregulation that confusion signals in this context.