Why do you get dementia?
Alzheimer’s and other forms of dementia result in nerve cell loss or damage in the brain. Dementia affects people differently and causes distinct symptoms depending on which part of the brain is affected.
Dementias are frequently classified according to their common characteristics, such as the protein or proteins stored in the brain or the affected brain area. Some disorders, such as those caused by pharmaceutical reactions or vitamin deficiency, resemble dementias and may improve with therapy.
In dementia, nerve cells and their connections in the brain are damaged or destroyed. So, I think this is why we get dementia. Dementia symptoms and causes vary among individuals based on the brain area that has been damaged.