Dementia: main causes

 VITAMIN D VEST:
Vitamin deficiency (B12, folate, thiamine)
Intracranial tumour
Trauma (head injury)
Anoxia
Metabolic (diabetes)
Infection (postencephalitis, HIV)
Normal pressure hydrocephalus
Degenerative (Alzheimer's, Huntington's, CJD, etc)
Vascular (multi infarct dementia)
Endocrine (hypothyroid)
Space occupying lesion (chronic subdural haematoma)
Toxic (alcohol)