Low protein may consider the following problems, insufficient intake, insufficient synthesis and excessive loss in patients, as follows: 1. Patients eat poorly, when some patients, such as those with digestive system diseases, have poor nutritional status and eat poorly, patients may not be able to take the initiative to ingest food, therefore leading to malnutrition may occur insufficient intake. 2. Patients may have poor absorption, when patients with malnutrition diseases will The intestinal function is very weak, can not well absorb the protein in food as a raw material for synthesis of albumin, which makes the synthesis of albumin reduced, such as having some digestive tract tumors. 3, because of liver disease, albumin is mainly synthesized in the liver, when there is hepatitis or cirrhosis of the liver, liver function is damaged, can not synthesize normal albumin, also lead to the reduction of protein in the body. 4, because of some diseases If there is a disease in the kidneys, a large amount of albumin will be excreted from the urine, and a large amount of albumin will be lost. In short, all of these reasons are the main factors that lead to the decrease of protein.