What is a common symptom of hyponatremia?

Hyponatremia, which is a condition characterized by low sodium levels in the blood, can lead to a variety of symptoms due to the imbalance of electrolytes and its effect on fluid balance. One of the most common symptoms associated with hyponatremia is nausea and vomiting. This occurs because the brain is sensitive to changes in sodium levels, and low sodium can lead to cerebral edema (swelling of the brain). As the swelling progresses, it can cause increased intracranial pressure, which often manifests as gastrointestinal symptoms, including nausea and vomiting.

The other options represent symptoms that may not be directly associated with hyponatremia. Rapid heartbeat might occur in various conditions but is not a hallmark symptom of low sodium. Increased thirst generally occurs in states of dehydration or high sodium levels, while high blood pressure is typically not seen in cases of hyponatremia, as low sodium can sometimes lead to lower blood pressure due to the body’s compensatory mechanisms. Thus, nausea and vomiting stand out as key indicators of this electrolyte imbalance.