Name one symptom of hyponatremia.

Hyponatremia is characterized by low sodium levels in the blood, which can lead to various symptoms due to the resulting imbalances in fluid and electrolyte status within the body. One common symptom of hyponatremia is nausea or headache. These symptoms arise as the low sodium levels cause shifts in fluid balance across cell membranes, particularly affecting brain cells and leading to symptoms such as cerebral edema. This can result in neurological signs like headache, confusion, and nausea, reflecting the body’s response to changing osmotic pressures.

The other choices, while they might be associated with different conditions or electrolyte imbalances, do not directly correspond to the classic symptoms of hyponatremia. Nausea and headaches are particularly hallmark symptoms that indicate the body is struggling to maintain normal sodium levels and respond to the physiological distress caused by low sodium concentration.