General brain atrophy a few years into dementia is not certain, and brain atrophy with the cause of the disease and treatment, etc. are related. Brain atrophy refers to a phenomenon in which the brain tissue itself undergoes organic lesions and shrinks due to various reasons. There are many causes of brain atrophy, some of which are physiologic, such as age-related brain atrophy, and some of which are pathologic, such as Alzheimer’s disease, stroke, traumatic brain injury, and infection. Age-related brain atrophy may have no obvious clinical symptoms and will not develop into dementia, while brain atrophy caused by the above diseases may develop dementia. For example, localized brain atrophy caused by stroke can be treated in time without significant progression; if it is not controlled and treated, stroke can recur repeatedly and can develop into dementia within a short period of time. Brain atrophy due to Alzheimer’s disease generally has a continuous progression of symptoms, and the duration of the disease is usually 5 to 10 years. When brain atrophy is detected, it is recommended to consult a doctor in time to identify the cause of brain atrophy, and standardize the use of medication under the guidance of a physician to prevent or delay its progression.