Brain atrophy is mainly manifested clinically as a decline in brain function and memory, and the precursors of brain atrophy are mainly the following: first, the ability to learn new knowledge decreases, as age increases, patients will find that it takes longer and longer to learn new knowledge and need more and more time to learn a new knowledge or a new skill; second, the ability of spatial discrimination becomes worse, a significant proportion of patients with brain atrophy in ordinary A significant number of patients with cerebral atrophy do not have any problems in their daily life, but their spatial recognition ability will deteriorate; third, some patients will have unexplained dizziness, head swelling and personality changes before the appearance of obvious clinical symptoms.