Neuronal cells are permanent cells that do not regenerate; it is a continuous process of dying and never proliferating. Neuronal cells are a decreasing process in the body, so neurons have to remain stable and keep growing as the adult grows. If neurons are merely damaged and not yet dead, neuronal cells can be repaired, and neuronal cell repair is carried out by the differentiation and regeneration of neural stem cells. In general, there are various causes of neuronal cell death and damage, such as cerebral thrombosis or cerebral hemorrhage caused by trauma, or caused by neurodegenerative diseases, such as Alzheimer’s disease, which is caused by continuous neuronal damage and death. It is also caused by infectious diseases, such as viral encephalitis. In addition, poisoning can also cause neuronal cell damage.