Hypertonic saline is a solution that contains a higher concentration of salt (sodium chloride) than normal body fluids. It is often used in medical settings to treat conditions like hyponatremia, where sodium levels in the blood are too low. By providing extra salt, hypertonic saline helps to draw water out of cells and into the bloodstream, which can help restore normal sodium levels. This solution is typically administered intravenously and must be used carefully, as it can lead to complications if given too quickly or in excessive amounts. Medical professionals monitor patients closely to ensure safety and effectiveness during treatment.