Too low or too high sodium in the body can cause some damage to the body. Low sodium can lead to tiredness and fatigue, etc. Prolonged high sodium intake is a high risk factor for high blood pressure. Low sodium is called hyponatremia. Common symptoms of hyponatremia include poor concentration, fatigue, and unresponsiveness. Patients with severe hyponatremia may experience dizziness, headache, confusion, impaired consciousness, and in severe cases, coma. Hyponatremia can also lead to damage to multiple organs in the body, such as the heart, brain, lungs, liver, etc., which in turn causes corresponding clinical symptoms. Excessive sodium in the body is called hypernatremia, and patients with high sodium will lead to high blood pressure, and patients will develop hypertonic thirst, fatigue, decreased urine output, and increased heart rate. Patients will have a series of neurological symptoms due to the hypertonic state, and the typical symptoms of headache and dizziness are common; some patients can also have dry skin, decreased blood pressure, and acute renal failure.