Low serum albumin refers to albumin <35g/L. Clinically, the causes of albumin reduction include the following: 1. Inadequate albumin intake, commonly seen in the elderly and vegetarians who do not eat meat for a long time, resulting in reduced albumin intake and lower albumin. 2. Infectious diseases, such as tuberculosis, autoimmune system diseases, such as systemic lupus erythematosus, can also result in lower albumin. 3. 4. Kidney diseases such as nephrotic syndrome, glomerulonephritis, chronic renal insufficiency can cause excessive loss of albumin from the urine resulting in 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 original disease, only when the cause is removed to treat the root of the hypoproteinemia.