Low albumin should be treated according to the cause, which should be clarified first, such as impaired renal function, cirrhosis, malnutrition or chronic wasting disease. 1. Impaired renal function: proteinuria may be caused by glomerulonephritis, resulting in loss of albumin in the blood and low albumin in the test results. In this case, relevant examination should be done to clarify what kind of kidney disease is caused, such as nephrotic syndrome, acute glomerulonephritis, etc., and treat the cause. 2. Liver cirrhosis: human body needs to rely on the liver to produce albumin, when cirrhosis, due to the albumin production disorder can lead to a decrease in blood albumin; at this time, we should clarify the cause of cirrhosis, to slow down the progress of the disease. 3. Malnutrition/chronic wasting disease: this kind of disease is common in the elderly (with or without underlying disease), nutritional intake/absorption is too low, tumor/malignant disease. The first two result in reduced protein intake or absorption, and the latter in excessive consumption. In this case, nutritional supplementation should be targeted on the basis of treatment of the primary disease. Prolonged low albumin may further lead to edema, which should be actively diagnosed and treated with protein supplementation based on the treatment of the primary disease, which can be guided by the clinician.