Low sodium, also known as hyponatremia, refers to a condition where the sodium levels in the blood are lower than normal. Sodium is a crucial electrolyte that helps regulate water balance in and around the cells, maintain blood pressure, and support nerve and muscle function. Normal sodium levels range from 135 to 145 milliequivalents per liter (mEq/L). Hyponatremia is often defined as sodium levels below 135 mEq/L.
