Blood ammonia must be kept within a certain range in the body. Increased blood ammonia can have obvious adverse consequences for the human body. The consequences of increased blood ammonia have the following two parts: First, direct effects on the central nervous system, because blood ammonia central nervous system can have obvious toxic effects, leading to a series of symptoms such as consciousness coma, delirium, mania, etc., often clinically known as hepatic encephalopathy. Secondly, the consequences of elevated blood ammonia are also closely related to the specific diseases that cause elevated blood ammonia. The most common diseases that cause elevated blood ammonia clinically are various liver diseases, such as cirrhosis and liver cancer, which can have different consequences, for example, patients with liver cancer have severe liver cell damage, and if symptoms of liver failure occur, they are manifested as increased transaminases, yellow sclera, decreased appetite, ascites, abdominal distension, and even lead to the death of the patient. Therefore, the consequences of elevated blood ammonia have two parts, one part is the symptoms of central nervous system, and the other part is the symptoms of the primary disease that causes elevated blood ammonia.