What causes low sodium level?
(Chicago Tribune Religion News)

Q: My recent blood tests were normal except for a low sodium level at 132 mEq/L. I feel fine. What would cause a low sodium level? A: The normal level of sodium in the blood is between 135 mEq/L (milliequivalents per liter) and 145 mEq/L. A level below 135 is low. Doctors call it hyponatremia....