For low serum sodium, it is important to understand the causes of low sodium: 1. If low serum sodium is caused by nutritional deficiency, it is necessary to strengthen nutrition and supplement sodium in the diet, you can put more salt in the water or put more salt in the food for sodium supplementation. 2. If it is acute hyponatremia, it is necessary to carry out the treatment of infusion, only a large amount of infusion, infusion of concentrated sodium, can be completely replenished. 3. chronic hyponatremia, it is necessary to understand the cause of hyponatremia, to prohibit taking diuretics during this period, and then to slowly replenish sodium.