Alcoholic dementia or alcoholic dementia is a primary and characteristic dementia caused by the chronic direct effect of alcohol on brain tissue. It is an organic brain damage caused by long-term and heavy drinking, and is the most serious state of chronic alcoholism. It manifests as tremors, delirium, convulsions, acute or chronic personality changes, mental retardation, memory impairment, etc. Alcoholic dementia accounts for about 2% of patients with chronic alcoholism. This diagnostic name has been widely used, but its naming is not unified. Similar diagnostic names include: alcoholic degenerative state, chronic alcoholic psychosis, alcoholic chronic or organic brain syndrome. There has been no satisfactory boundary for this disease, either clinically or pathologically. In recent years, people have tried to accurately define alcoholic dementia. However, due to different data reported by various sources and a wide range of clinical manifestations, it is difficult to have a consistent standard.