“Hyponatremia: Causes, Symptoms, and Treatment - A Quick Guide” Hyponatremia is a condition where the concentration of sodium in the blood is lower than normal (less than 135 mEq/L). This can be caused by various factors such as Increased sodium excretion in Diaphoresis (example: high fever) Diarrhea and vomiting Drains (NGT suction) Diuretics (thiazide and loop) Other risk factors for hyponatremia include kidney disease, congestive heart failure, liver disease, SIADH, Adrenal crisis, inadequate