Sodium levels refer to the concentration of sodium in the blood, which is essential for various bodily functions, including maintaining fluid balance, transmitting nerve impulses, and regulating blood pressure. Normal sodium levels typically range from 135 to 145 milliequivalents per liter (mEq/L). Abnormal sodium levels can lead to health issues. Low sodium levels, known as hyponatremia, can cause symptoms like confusion and fatigue, while high sodium levels, or hypernatremia, may lead to increased thirst and potential complications like high blood pressure. Monitoring sodium levels is important for overall health.