What causes dementia?
There are several types of dementia and each type may be associated with a different cause, including: 1) Alzheimer's disease, the most common type of dementia. For most people who develop this type, the cause is not yet known. 2) Vascular dementia, which is caused by a reduced blood supply to the brain due to a stroke. 3) Lewy body dementia, which is caused by ta build-up of specific proteins in the brain's neurons. Nutritional deficiencies, such as low levels of vitamin B12 or abnormal thyroid levels, may also cause some cases of dementia.