Low protein in the blood has the following factors: 1. Accelerated protein catabolism and reduced synthesis, such as hypoproteinemia can occur in patients with long-term infections, fever, pernicious tumors, severe anemia, immune diseases, AIDS, etc. 2. Patients can also experience protein catabolism when they have endocrine disorders, such as catabolic hyperactivity, hyperthyroidism, and hyperadrenocorticism 3. Low protein in the blood can also occur when there is excessive long-term protein loss, such as renal syndrome, systemic lupus erythematosus, peritoneal dialysis, malignant hypertension, and severe diabetes mellitus, all of which may lead to a large loss of protein and result in low protein in the blood. 4. Liver cirrhosis and other common diseases such as damage to liver function, acute liver necrosis or cirrhosis can also result in low protein in the blood, and low protein in the blood can also occur when digestive system diseases lead to insufficient protein intake.