Hepatic encephalopathy precursor symptoms include impaired consciousness, mental abnormalities, and personality changes. Hepatic encephalopathy is a series of neuropsychiatric symptoms that occur in the advanced stage of liver failure due to the inability to detoxify large amounts of ammonia-containing hazardous substances in the liver, as well as insufficient nutrients in the nervous system. 1. Early manifestations of liver failure and hepatic encephalopathy are personality changes, such as behavioral manifestations that suggest abnormalities under normal circumstances, which are not easily detected. It may also be manifested as decreased attention span, accompanied by mild cognitive impairment. 2. Early stage of hepatic encephalopathy may also manifest as mild consciousness disorder, such as drowsiness, lethargy, etc., and semi-coma and deep coma in severe cases. 3. Early stage of hepatic encephalopathy may also show abnormal mental symptoms, such as hallucinations, hallucinations, expression indifference, depressed mood and so on. Once the early symptoms of hepatic encephalopathy appear, it is recommended to go to the hospital for treatment in time to improve the liver function, so as to avoid the aggravation of the condition and the emergence of coma and respiratory failure, which may lead to death.