There are many factors leading up to Dementia where if the brain is exposed to multiple strokes then Vascular Dementia can occur.
Certain degenerative neurological diseases, for example Creutzfeldt-Jakob Disease, Parkinson's Disease, Huntington's Disease, and multiple sclerosis can cause Dementia.
Additionally, there can be be some triggers that can accelerate the development of Dementia, for instance the Human Immunodeficiency Virus (HIV) and some central nervous system infections, such as Meningitis (inflammation of the brain membrane).
Other concerning factors includes traumatic injury to the brain caused by a sudden fall or automobile accidents, abuse of alcohol and drugs, depression, family history of dementia, and increasing age.
There also diseases that can speed up the process of Dementia which includes diabetes, high blood pressure, and high cholesterol levels.
When there is too much fluids in the brain from infections or tumours, it can induce the risk of Dementia.