Severe hyponatremia occurs when serum sodium levels fall below 125 mEq/L, representing a critical electrolyte imbalance that affects multiple body systems, especially the brain and muscles. Sodium is essential for maintaining fluid balance, nerve function, and muscle contractions. When sodium levels drop to 122 mEq/L as in this case, several clinical symptoms and signs are anticipated that nursing professionals must recognize early to provide appropriate care. The primary neurological manifestations include confusion, lethargy, stupor, seizures, and in extreme cases, cerebral edema due to water moving into brain cells. This fluid shift can be life-threatening, making close neurological assessment vital. Musculoskeletal symptoms of hyponatremia include muscle spasms and cramps, which arise because sodium plays a key role in muscle cell function and nerve conduction. The fluid volume deficit created by decreased sodium reduces overall blood volume, often leading to decreased urine output. Gastrointestinal symptoms to expect include abdominal cramps, nausea, and vomiting. Additionally, nurses should note that hypoactive bowel sounds are not typical in hyponatremia; instead, hyperactive bowel sounds may be observed due to increased intestinal activity from muscle irritability. It is important to distinguish hyponatremia from other electrolyte imbalances. For example, arrhythmias such as tall, peaked T-waves are characteristic of hyperkalemia—not hyponatremia—so their presence would suggest a different diagnosis. Regular monitoring of serum electrolytes, neurological status, and fluid input-output balance are crucial interventions. Nurses should ensure prompt reporting of worsening symptoms and preparation for possible emergency treatments such as hypertonic saline administration under physician guidance. This practice question highlights the critical thinking needed to interpret laboratory values and correlate them with clinical symptoms, a vital skill for passing the NCLEX and providing high-quality patient care.