Dementia primarily refers to Alzheimer's disease, which mainly has two types: The first type is sporadic Alzheimer's disease, which does not have a clear familial history. It is caused by the degeneration and death of neurons due to various reasons, leading to certain clinical symptoms. This type of sporadic dementia does not have a genetic predisposition. The other type of dementia has a clear family history, where patients typically exhibit mutations in the APP gene, leading to increased secretion, which in turn causes the death of neurons and results in the symptoms of dementia. This familial type of dementia has a genetic predisposition. Dementia is a common condition in neurology and is the most common neurodegenerative disease. Currently, there are no effective treatments available. Family members must pay attention to caregiving, and patients can take cholinesterase inhibitors, which can improve symptoms to a certain extent.