120 is a very low number for sodium, and may result in seizure activity. The normal range for sodium is 135 to 145 mEq/L (millequivelents per liter.)
Just to add to this, my sodium is 122 and my doctor said that this is very near critical. If you have a blood sodium level at 120 your doctor should be taking steps to correct it and find the cause.
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normal serum Na+ concentration is usually 135-145 meq/L .its a bit low but in normal range