There is no one cause of dementia. Many different conditions can cause dementia. The most common causes of dementia are neurodegenerative diseases, such as[1]:
- Alzheimer’s Disease
- Vascular dementia
- Dementia with Lewy bodies
- Parkinson’s disease
- Frontotemporal lobar degeneration
Although rare, other conditions may also cause dementia or similar symptoms. Some examples include[2][1]:
- Vitamin B12 deficiency
- Hypothyroidism
- Creutzfeldt-Jakob disease
- Huntington’s disease
- Pellagra