What are some common causes of dementia in the elderly?

Alzheimers. 70% of people who have dementia have alzheimers disease. But strokes can cause vascular dementia. Lewy body dementia and frontal temporal lobe dementia are also fairly common. Less common types include alcohol, head injuries, and excessiive spinal fluid. There are many other neurological illnesses that can lead to dementia too.
Senile/Alzheimer's. The majority of cases of dementia are caused by degenerative causes and by vascular causes: senile, alzheimer's, mulinfarct, atherosclerotic dementias. Other causes include infections, inflammatory diseases, neoplasm, toxic insults, metabolic disorders, and trauma. An estimated 10% to 20% of dementias are caused by potentially reversible conditions: syphilis, thyroid disease, vitamin B12 deficit?
There are many types. 70% of people who have dementia have alzheimers disease. But strokes can cause vascular dementia. Lewy body dementia and frontal temporal lobe dementia are also fairly common. Less common types include alcohol, head injuries, and excessiive spinal fluid. There are many other neurological illnesses that can lead to dementia too.