Low albumin is commonly caused by various reasons, such as insufficient synthesis or excessive loss of albumin. 1. Insufficient synthesis of albumin can be seen in liver diseases, such as acute hepatitis, chronic hepatitis, cirrhosis, ischemic liver injury and other diseases, the synthesis function of liver cells is hit, resulting in a decrease in albumin; it can also be seen in malnutrition, insufficient intake or poor digestion and absorption of the population, due to a lack of protein intake, resulting in a decrease in albumin. 2. Excessive loss of albumin can be seen in a variety of diseases resulting in loss of albumin, such as protein-losing gastrointestinal disease, nephrotic syndrome, burns, blood loss and other patients; can also be seen in chronic wasting disease, such as tuberculosis infection, hyperthyroidism, malignant tumors and other diseases. In addition to this, an increase in serum water, such as sodium retention due to conditions such as heart failure and the effects of medications, can cause a relative decrease in albumin values. The normal value of albumin in adults is 40-55g/L. When a decrease in albumin is detected, prompt medical attention should be sought for further investigation and diagnosis by a doctor to avoid delaying the condition.