The main causes of hypoproteinemia are insufficient intake, excessive excretion, excessive consumption, and too little synthesis. Hypoproteinemia mainly refers to low albumin. Albumin synthesis is mainly in the liver, so when the liver has cirrhosis, or when the liver is not functioning well, it will cause a serious decrease in albumin synthesis, which will result in a decrease in albumin. In addition, if the patient usually consumes too little albumin, absorption disorders, and partial diet will also lead to malnutrition, resulting in low albumin. In addition, some diseases can play a long-term depleting role on albumin, including malignant tumors, repeated high fever, repeated infections and other factors, which can consume a large amount of albumin, thus causing its depleting decline. Patients should also pay attention to some kidney diseases, nephritis will increase the filtration rate of albumin, albumin macromolecules through the corresponding kidney filtration membrane to reach the urine inside, resulting in proteinuria, a large amount of protein from the urine, resulting in low albumin, so for these aspects of the cause, patients can further check, confirm.