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Sodium and Potassium

In this Section:


  • Sodium is the major electrolyte that maintains normal fluid outside the cells.
  • Too much sodium can contribute to edema and high blood pressure.
  • Too little sodium can cause low blood pressure and dizziness.


  • Potassium is the major electrolyte inside of cells.
  • Low potassium can cause muscle weakness and irritability, constipation, depression, and heart problems and is very dangerous.