What does it mean if blood sodium levels are low in a lab test?

It may be caused by insufficient sodium intake or other reasons. It mainly occurs when excessive water consumption leads to reduced sodium concentration in the blood. In terms of diet, it is important to control fluid intake and moderately increase salt consumption. When the body's metabolism is abnormal, a large amount of sodium ions may be lost, resulting in low blood sodium levels. In addition, conditions such as malignant tumors can cause significant sodium loss in the body, leading to hyponatremia.