A nurse is collecting data from a client who has a sodium level of 128 mEq/L (136-145 mEq/L) Which of the following manifestations should the nurse expect?

A. Constipation is not typically associated with hyponatremia; gastrointestinal symptoms are more likely to include nausea or vomiting. B. Hyporeflexia is not a common manifestation of low sodium; hyponatremia primarily affects neurological function rather than neuromuscular reflexes. C. Increased appetite is unrelated to sodium levels and does not indicate hyponatremia. D. Headache is a common symptom of hyponatremia due to cerebral edema from water shifting into brain cells. Other neurological manifestations may include confusion, lethargy, seizures, or irritability.