Patients with brain atrophy are not necessarily suffering from Alzheimer’s disease. Brain atrophy may cause memory loss and cognitive dysfunction in severe cases, and is a neurodegenerative disease. The chance of brain atrophy increases significantly with age and is caused by the degeneration of brain cells. Deepening of the brain sulcus and narrowing of the brain gyrus may be seen on brain MRI or brain CT examination. Alzheimer’s disease can be caused by a variety of factors, including Alzheimer’s disease, Lewy body dementia, multiple system atrophy, etc. Pre-Alzheimer’s disease can also show memory function decline, mainly near memory decline is obvious, as the disease worsens, cognitive dysfunction may appear, you can apply some drugs to improve brain metabolism, also can apply donepezil, may improve the symptoms.