The treatment of hyponatremia in the elderly should be based on the etiology, severity, and urgency of the onset of the original disease to take different treatment methods. And distinguish mild, moderate and severe hyponatremia for treatment. 1. Mild hyponatremia: When mild hyponatremia occurs in elderly patients, dietary therapy can generally be adopted to increase salt intake in food or oral concentrated sodium chloride injection, which can effectively restore the blood sodium level. 2. Moderate hyponatremia: water intake can be restricted, and oral hypertonic saline, oral sodium salt, or oral tolvaptan, kunivaptan, etc. can be administered. 3. Severe hyponatremia: Intravenous hypertonic saline infusion is needed to treat patients with severe hyponatremia. In clinical sodium supplementation need to strictly calculate the amount and concentration of sodium supplementation, need to follow the doctor’s instructions to actively cooperate with the doctor’s treatment, do not self-medication, so as not to delay the condition or cause adverse reactions.