Serum albumin is synthesized in the liver, and low serum albumin may be caused by insufficient protein intake, infectious diseases, serious liver function damage or kidney diseases, as follows: 1. Insufficient protein intake: reduced protein intake and lack of synthesized raw materials cause lower albumin. 2. Infectious diseases: Tuberculosis, autoimmune diseases and other infectious diseases will also reduce albumin. 3. Serious liver function damage: cirrhosis, viral hepatitis and other liver diseases can cause liver function damage, resulting in a decrease in the function of the liver to synthesize albumin, resulting in a decrease in albumin. 4. Kidney diseases: Nephrotic syndrome, glomerulonephritis, chronic renal insufficiency and other kidney diseases can cause excessive loss of albumin from the urine and cause a decrease in albumin. For the treatment of low albumin, on the one hand, you can give supplemental albumin treatment, on the other hand, you also need to treat the cause of the disease, only when the cause of the disease is removed to treat the root cause of hypoproteinemia.