Symptoms range from nausea and malaise, with mild reduction in the serum sodium, to lethargy, decreased level of consciousness, headache, and (if severe) seizures and coma. Overt neurologic symptoms are most often due to very low serum sodium levels (usually < 115 mEq/L), resulting in intracerebral osmotic fluid shifts and brain edema.
For more on the clinical presentation of hyponatremia, read here.
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Cite this: Fast Five Quiz: Can You Quickly Identify and Treat Hyponatremia? - Medscape - Jul 16, 2014.