The reasons for the occurrence of cytoedema in hepatic encephalopathy are related to various factors such as vascular origin and cytotoxicity. 1. Cellular edema of vascular origin: after the occurrence of hepatic encephalopathy, the blood-brain barrier will be damaged, which in turn will cause the increase of vascular permeability and the change of hemodynamics, and the components in the blood will enter the brain cells, which will result in the edema of the brain tissues. 2. Cytotoxic cell edema: when hepatic encephalopathy occurs, a large amount of ammonia will be produced, and ammonia and glutamic acid will synthesize glutamine, which will enter the brain cells along with the water, thus causing edema of the brain cells. In addition to the above two causes, there are many other factors involved in the formation of brain cell edema, and it is recommended to receive standardized treatment as soon as possible in order to improve the prognosis of the disease.