Adding salt to the diet often remedies a mild form of low sodium in the blood, as Mayo Clinic explains. Medications that lower sodium levels, such as diuretics and anti-depressants, may require adjusting by a doctor.
Low blood sodium is known as hyponatremia, notes Healthline. Maintaining the correct balance between water and salt intake aids in treating hyponatremia. Athletes, physical laborers and people living in hot climates often drink a considerable amount of water throughout the day. Such people can supplement their diets with a rehydration beverage containing electrolytes to boost sodium levels. A doctor may recommend an intravenous sodium solution for severe forms of hyponatremia and seek the underlying cause for this condition.