Low blood ammonia in cirrhosis indicates that anemia, malnutrition, or a long-term low-protein diet may be present. Cirrhosis patients need to maintain a long-term low-protein diet in order to avoid triggering hepatic encephalopathy, when the intake of protein or amino acids is insufficient, the body’s amino acid metabolism will be abnormal, resulting in a decrease in blood ammonia. Cirrhosis will have symptoms such as loss of appetite, which can lead to reduced food intake and malnutrition caused by insufficient intake can also cause low blood ammonia. In addition, cirrhosis can be combined with hypersplenism, resulting in a decrease in peripheral blood cells, causing anemia, and when the blood volume decreases, the proportion of blood ammonia also decreases. Patients with cirrhosis who have low blood ammonia are advised to go to the hospital and ask the doctor to make a judgment and clarify the cause of the disease.