My sodium levels have gone down to 121 and I went into the hospital for 3 days and they gave me 3 bags of fluid to bring me up to 137 and released me and my regular doctor checked me and it is four weeks later and I am down to 131 now.  He feels I may need to see a kidney specialist... any thoughts??  thanks
Hi, Thanks for writing in. A normal sodium level is between 135 and 145 milliequivalents per liter (me/L) of sodium. Low sodium or Hyponatremia occurs when the sodium in your blood falls below 135 me/L. Causes of low sodium awesome medications, such as some water pills (diuretics), antidepressants and pain medications, Heart, kidney and liver problems. Syn Chat Doctor. Chronic, severe vomiting or diarrhea.