The common clinical cause of hepatic encephalopathy is due to increased blood ammonia, which is commonly caused by the following reasons: 1. Infection, commonly abdominal infection, urinary tract infection, lung infection, etc., because of the increase of bacteria in the body, the increase of bacterial ammonia production and hepatic encephalopathy. 2. Excessive consumption of high-protein food, protein decomposition into ammonia, so that the increase of blood ammonia induced hepatic encephalopathy. 3. It is common to see hepatic encephalopathy caused by the rupture of esophagogastric fundic varices and bleeding, which leads to the increase of blood ammonia. In addition to increased blood ammonia, it can also be seen in large amounts of ascites, the use of diuretics hypokalemia, secondary alkalosis induced hepatic encephalopathy, or the use of sedative and hypnotic drugs such as Valium also easily induced hepatic encephalopathy.