Hyponatremia can be clinically manifested with different degrees of symptoms such as mild to severe, and will present with symptoms such as lethargy, weakness, blood pressure drop, coma, nausea, vomiting, etc.: 1. mild to moderate: patients will present with symptoms such as lethargy, weakness, indifferent expression, lack of concentration in the eyes, easy to faint when standing up, and hypotension when standing upright; 2. moderate to severe: patients will present with symptoms such as blood pressure drop, nausea, vomiting, headache, and drowsiness in addition to mild symptoms; 3. 3. Severe: Patients experience coma, convulsions, epilepsy, etc., and respiratory failure if cerebral edema is aggravated. Untimely detection may even lead to death. The concentration of sodium in human blood is 135-145 mmol/L. If the concentration is lower than 135 mmol/L, it is called hyponatremia. The clinical manifestation of hyponatremia depends on the rate of decrease of blood sodium. If hyponatremia occurs at a faster rate, it is prone to greater risks, such as respiratory arrest or death, or even permanent sequelae of neurological damage. In terms of treatment, different methods of targeted treatment need to be applied depending on the type of onset as well as the degree.